[Workflows] Enable commit access requests via GitHub issues (#100458)
This updates the auto-labeler to match a specific issue title that is
going to be used for requesting commit access and then add the
infrastructure:commit-access-request label.
This will notify the admin team who will be able to handle the request.
See
https://discourse.llvm.org/t/rfc-change-the-process-for-requesting-commit-access/80184
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Co-authored-by: Vlad Serebrennikov <serebrennikov.vladislav@gmail.com>