update CI for changeset check

[momentmaker]

This action checks PRs to see if any changeset files were added in the PR core files were changed. If none were, it will add a comment in the PR to run changeset command to generate a changeset file.

This should be merged after this PR has been merged:
#12198

[github-actions]

I see that you haven't updated any README files. Would it make sense to do so?

[chainchad]

Would it make sense to use https://github.com/smartcontractkit/.github/tree/main/actions/guard-from-missing-changesets here and if not integrate what you need to that composite action?

[momentmaker]

Would it make sense to use smartcontractkit/.github@main/actions/guard-from-missing-changesets here and if not integrate what you need to that composite action?

ahh I forgot it was there. I think this changeset guard is a bit different since we only want to filter out certain dir changes right?

also if we integrate the comment to pr action then we will need to integrate GATI into this composite action too right?

[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube