Jupyter extension creates countless empty ipynb (also creates "checkpoint" files after saving)

## Environment data

-   VS Code version: 1.57.1 (Universal)
-   Jupyter Extension version (available under the Extensions sidebar): v2021.6.999662501
-   Python Extension version (available under the Extensions sidebar): v2021.6.944021595
-   OS (Windows | Mac | Linux distro) and version: macOS 11.4 Big Sur (Apple M1 platform)
-   Python and/or Anaconda version: 3.8.10 (aarch64), 3.9.5 (aarch64) - homebrew
-   Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
-   Jupyter server running: Local 

## Expected behaviour

After saving changes in a jupyter notebook, only a single checkpoint file should be created

## Actual behaviour

After saving changes in a jupyter notebook, multiple random files appear in both the directory of the jupyter notebook file and the checkpoints folder

## Steps to reproduce:

1. Make changes to Jupyter notebook (adding a cell with `print("Hello world")` is enough)
2. run the cell 
3. save changes
4. refresh folder view and see the "junk" files


## Logs


```
Info 2021-07-02 12:35:50: Executing cell NotebookImport#26
Info 2021-07-02 12:35:50: Waiting for jupyter server and web panel ...
Info 2021-07-02 12:35:50: Checking for server existence.
Info 2021-07-02 12:35:50: Checking for server usability.
Info 2021-07-02 12:35:50: Server not usable (should ask for install now)
Error 2021-07-02 12:35:50: Exception attempting to start notebook:  [o [Error]: Jupyter cannot be started. Error attempting to locate jupyter: Select an Interpreter to start Jupyter
	at S.startServer (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:54:407589)
	at processTicksAndRejections (internal/process/task_queues.js:93:5)
	at async S.createServer (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:54:406884)
	at async connect (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:90:178208)
	at async D.ensureConnectionAndNotebookImpl (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:641568)
	at async D.ensureConnectionAndNotebook (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:639797)
	at async D.clearResult (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:635459)
	at async D.reexecuteCell (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:621723)
	at async D.reexecuteCells (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:618182)] {
  category: 'jupyterinstall',
  action: 'https://aka.ms/pyaiinstall',
  actionTitle: 'Get more help'
}
Info 2021-07-02 12:35:50: Exception executing cell NotebookImport#26:  [o [Error]: Jupyter cannot be started. Error attempting to locate jupyter: Select an Interpreter to start Jupyter
	at S.startServer (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:54:407589)
	at processTicksAndRejections (internal/process/task_queues.js:93:5)
	at async S.createServer (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:54:406884)
	at async connect (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:90:178208)
	at async D.ensureConnectionAndNotebookImpl (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:641568)
	at async D.ensureConnectionAndNotebook (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:639797)
	at async D.clearResult (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:635459)
	at async D.reexecuteCell (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:621723)
	at async D.reexecuteCells (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:618182)] {
  category: 'jupyterinstall',
  action: 'https://aka.ms/pyaiinstall',
  actionTitle: 'Get more help'
}
Info 2021-07-02 12:35:50: Finished executing cell NotebookImport#26
Info 2021-07-02 12:35:53: Cached data exists getEnvironmentVariables, <No Resource>
Info 2021-07-02 12:35:53: Cached data exists getEnvironmentVariables, <No Resource>
Info 2021-07-02 12:35:53: Process Execution: > /opt/homebrew/bin/python3 -c "import jupyter"
> /opt/homebrew/bin/python3 -c "import jupyter"
Info 2021-07-02 12:35:53: Process Execution: > /opt/homebrew/bin/python3 -c "import jupyter"
> /opt/homebrew/bin/python3 -c "import jupyter"
Info 2021-07-02 12:35:53: Process Execution: > /opt/homebrew/bin/python3 -c "import notebook"
> /opt/homebrew/bin/python3 -c "import notebook"
Info 2021-07-02 12:35:53: Process Execution: > /opt/homebrew/bin/python3 -c "import notebook"
> /opt/homebrew/bin/python3 -c "import notebook"
Info 2021-07-02 12:35:53: Cached data exists getEnvironmentVariables, <No Resource>
Info 2021-07-02 12:35:53: Process Execution: > /opt/homebrew/bin/python3 -m jupyter kernelspec --version
> /opt/homebrew/bin/python3 -m jupyter kernelspec --version
Info 2021-07-02 12:35:53: Process Execution: > /opt/homebrew/bin/python3 -m jupyter kernelspec --version
> /opt/homebrew/bin/python3 -m jupyter kernelspec --version
Error 2021-07-02 12:35:53: DataScience Error [o [Error]: Jupyter cannot be started. Error attempting to locate jupyter: Select an Interpreter to start Jupyter
	at S.startServer (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:54:407589)
	at processTicksAndRejections (internal/process/task_queues.js:93:5)
	at async S.createServer (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:54:406884)
	at async connect (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:90:178208)
	at async D.ensureConnectionAndNotebookImpl (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:641568)
	at async D.ensureConnectionAndNotebook (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:639797)
	at async D.clearResult (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:635459)
	at async D.reexecuteCell (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:621723)
	at async D.reexecuteCells (/Users/davidkorcak/.vscode/extensions/ms-toolsai.jupyter-2021.6.999662501/out/client/extension.js:37:618182)] {
  category: 'jupyterinstall',
  action: 'https://aka.ms/pyaiinstall',
  actionTitle: 'Get more help'
}
Info 2021-07-02 12:35:54: Cached data exists getEnvironmentVariables, <No Resource>
Info 2021-07-02 12:35:54: Creating daemon pool for /opt/homebrew/bin/python3 with env variables count 0
Info 2021-07-02 12:35:54: Process Execution: > /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
> /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
Info 2021-07-02 12:35:54: Process Execution: > /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
> /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
Info 2021-07-02 12:35:54: Process Execution: > /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
> /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
Info 2021-07-02 12:35:54: Process Execution: > /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
> /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
Info 2021-07-02 12:35:54: Process Execution: > /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
> /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
Info 2021-07-02 12:35:54: Process Execution: > /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v
> /opt/homebrew/bin/python3 -m vscode_datascience_helpers.daemon --daemon-module=vscode_datascience_helpers.jupyter_daemon -v

```

## More info

This bug **DOES NOT** manifest itself on my Windows 10 system running the same environment on x86 processor. Seems to be either macOS or macOS aarch64 exclusive. Also **DOES NOT** happen when using jupyter notebook web environment, only in VS Code. It has been reported multiple times already with no answers:
https://stackoverflow.com/questions/64259277/vscode-jupyter-server-generates-random-ipynb-files?r=SearchResults&s=1|66.8220
https://stackoverflow.com/questions/65239027/visual-studio-code-jupyter-interactive-how-to-disable-the-automatic-creation?r=SearchResults&s=3|54.7774

## Screenshots 
Before
<img width="1440" alt="Snímek obrazovky 2021-07-02 v 12 20 09" src="https://user-images.githubusercontent.com/75120655/124262859-dac31d80-db32-11eb-8bf3-e0abc72f95af.png">
After
<img width="1440" alt="Snímek obrazovky 2021-07-02 v 12 22 18" src="https://user-images.githubusercontent.com/75120655/124262876-e0b8fe80-db32-11eb-86aa-6c809b164125.png">

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Jupyter extension creates countless empty ipynb (also creates "checkpoint" files after saving) #6510

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Jupyter extension creates countless empty ipynb (also creates "checkpoint" files after saving) #6510

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Actual behaviour

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Logs

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