[llvm] github-automation: Use a single comment for team mentions on pull requests (PR #66037)

[Vlad Serebrennikov via llvm-commits]

Endilll wrote:

> all the bugzilla bugs have a CC fields that ping everyone in the issue

Quite often it's not helpful. On Clang side it's not helpful at all.

https://github.com/llvm/llvm-project/pull/66037