Command-line help not working

### Expected behaviour
When I run `karma --help` from the command line, I should see the CLI help text.

When I run `karma [command] --help`, I should see help text specific to that command.

### Actual behaviour
When I run `karma --help`, I see the following:

```
$ node_modules/.bin/karma --help
Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]
```

When I run `karma` on its own, I see the following:

```
$ node_modules/.bin/karma
Command not specified.
Karma - Spectacular Test Runner for JavaScript.

Usage:
  karma <command>

Commands:
  start [<configFile>] [<options>] Start the server / do single run.
  init [<configFile>] Initialize a config file.
  run [<options>] [ -- <clientArgs>] Trigger a test run.
  completion Shell completion for karma.

Run --help with particular command to see its description and available options.

Options:
  --help     Print usage and options.                                  [boolean]
  --version  Print current version.                                    [boolean]
```

When I run `karma start --help` (or any other command), I see the following:

```
$ node_modules/.bin/karma start --help
Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]
```

### Environment Details

- Karma version (output of `karma --version`): **5.0.2**
- Relevant part of your `karma.config.js` file: **not applicable**

### Steps to reproduce the behaviour

1. Run `karma --help`
2. Run `karma start --help`

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Command-line help not working #3474

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Command-line help not working #3474

Description

Expected behaviour

Actual behaviour

Environment Details

Steps to reproduce the behaviour

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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