Added linter for checking if latest changes to Argo CD are already available in the PR

[anandf]

What type of PR is this?

What does this PR do / why we need it:

Have you updated the necessary documentation?

• [ ] Documentation update is required by this PR.
• [ ] Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer: