Added edge case checking in isGreen (#79565)
Relates to #76700
**Overview**: One edge case not accounted for in the original logic of `isGreen` was for commits with no workflow checks. Similarly, if any of the required checks are not present (ex: if all of the pull checks are skipped), the workflow should not be promoteble. A commit should only be promoteable if there is it least one workflow check from each required group present (i.e. none of them are skipped)
**Test Plan:** Verify that commits on the HUD with no workflow checks are not considered promote-able. Added a test case with no workflows in `test_print_latest_commits.py`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79565
Approved by: https://github.com/seemethere
