Add https://github.com/github/ai-assessment-comment-labeler

Add a workflow to automatically analyse new issues with:
https://github.com/github/ai-assessment-comment-labeler

Refer to the installer docs that describe in more details how to use this workflow: https://github.com/github/ai-issue-assessment-commenter-installer/blob/main/README.md

Make minimal changes, it's better to run it less often than to create noise. If you are unsure don't add anything.