fix(ci): support checking forks in PR-title check workflow

[rjan90]

Related Issues

Encountered this workflow-failure when looking at merging: #12354 (comment)

Proposed Changes

• Use pull_request_target event trigger in pr-title-check-yml in order to support checking PRs from forks.

Additional Info

Creating this PR from my Lotus-fork to confirm that it now succeeds

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title conforms with contribution conventions
• Update CHANGELOG.md or signal that this change does not need it per contribution conventions
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[BigLep]

@rjan90 : I did some more research here as well, and it looks like this addresses the problem you saw in #12354 (comment) . I may have gotten confused from our call - what is leading you to think this doesn't/won't work? (If things are working, feel free to disregard.)

One nit is that I think we can drop the synchronize type since that is for when commits have been pushed which I think is separate than PR titles.