[vscode-concourse] complains about old_name in a job

[parkeyparker]

As of Concourse 5.2.0 old_name is an optional property for a job allowing for the inheritance of job history in the case of a rename. The documentation of this feature can be found here.

The following is a valid example:

jobs:
  - name: new-job-name
    old_name: original-job-name
    plan:
      - ...

I may try to create a PR for this if I get time as a nice small task