Expected Behavior
Every properties from the current Concourse pipeline descriptor specification should be recognized by the extension.
Including old_name on resources (cf. doc) and load_var steps (cf doc).

Current Behavior (with v1.25.1)
If I try to specify an old_name on a resource, the extension marks it as an error : Unknown property 'old_name' for type 'Resource'(YamlSchemaProblem).

If I put a load_var step, I get the error Unknown property 'load_var' for type 'Step'(YamlSchemaProblem)

Context

jobs:
  - name: test
    plan:
      - get: my-sources      
      - load_var: test-load
        file: my-sources/test-file
resources:
  - name: my-sources
    old_name: your-sources
    type: git
    source:
      uri: ssh://git@my_repo/my-sources.git
      branch: master