[llvm] [workflows] Add a new workflow for checking commit access qualifications (PR #93301)

[Tom Stellard via llvm-commits]

tstellar wrote:

> * The Github library we're using doesn't support querying the GraphQL API? And there's no other well-supported libraries that do? It would be nice if we could do that instead.
> 

I could not find one that works with GitHub.

> * It would be nice if we could unit test this. That would probably require mocking the whole thing though and require a lot of work. I'm not going to block on that because that would take quite a bit of effort, the results are going to be manually curated anyways, and something here is better than nothing, but it would be nice to have.
> 

I think if the whole process were automated, then this would be more important, but the manual review means mistakes can get caught and have a smaller impact.

> * Typing annotations/doc strings - Would be nice to have, but not going to require them. The function names/comments make things pretty clear already.

I've added these.


https://github.com/llvm/llvm-project/pull/93301