Change batch-job-base template from json to YAML

[aaronegolden]

Batch supports YAML job configurations now so we can use YAML everywhere instead of JSON, which will hopefully make some of the conditional syntax in the templates easier to manage.

Submission Checklist

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cloud HPC Toolkit Contribution guidelines #

[nick-stroud]

/gcbrun
Waiting for batch integration tests.

[nick-stroud]

/gcbrun