add support for skipping required checks

[lrapoport-cf]

for some PRs, running the the full gamut of checks is unnecessary and inefficient. add support to skip required checks for PRs which do not benefit from the entire suite.

example PRs where this would have been helpful/relevant:

• Update v2 readme #6660
• Version Packages #6710
• chore: update changeset message #6737
• Update ISSUE_TRIAGE.md #6637

reference: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks