ci: ensure conventional commit PR title

[kb-newrelic]

Summary

• Simple workflow to validate PR title to avoid the suggested commit message to not adhere to conventional commits and therefore end up excluded from the auto-generated changelogs in the draft release.
• If it fails, it comments (like here when I removed the ci: prefix from the title) and fails the workflow

[github-actions]

PR title '{"title":"test foobar 2"}' does not adhere to conventional commits. Change PR title to ensure that the suggested squash commit follows the conventions and thus ends up in the changelog.

[github-actions]

PR title 'ensure conventional commit PR title' does not adhere to conventional commits. Change PR title to ensure that the suggested squash commit follows the conventions and thus ends up in the changelog.

[mailo-nr]

LGTM