We don't need this anymore since all new contributors in the last year
have applied for commit access using GitHub issues. There is already
code in the script that removes anyone who submitted a request, so we
don't need the old code any more (which was way too conservitave and
very slow).

Now that we are accepting commit access requests via GitHub issues, we
can keep track of who has recently requested access.

We switched to using a new label name for tracking commit access
requests.

This gets us the full list of users with commit access to
llvm/llvm-project rather than the list of people in the llvm-committers
team. This will ensure we are able everyone to track everyone with
commit access in case they receive access some other way.

This workflow produces a list of users that should be moved to the LLVM
Triagers team. An admin will review the list and then manually move
people to the LLVM Triagers Team.

I've also added some documentation to the Developer Policy about the
Triage Role.

See
https://discourse.llvm.org/t/rfc2-new-criteria-for-commit-access/77110
for more details.