[Dev] Improve invalid PR title workflow message to explain automatic draft conversion #50553

Describe the enhancement requested

The developer PR workflow automatically converts pull requests with invalid titles to drafts (#50467) and posts a guidance comment.

The current message explains the required title format, but it doesn't explicitly state that the pull request was converted to a draft because of the invalid title or that the title should be corrected before marking the pull request as ready for review.

This can be unclear to contributors, who may manually mark the pull request as ready for review without first updating the title.

It would be helpful if the guidance comment explicitly explained why the pull request was converted to a draft and instructed contributors to fix the title before marking it as ready for review.

Component(s)

Developer Tools