[llvm] [CI] Add Python Script for Computing Projects/Runtimes to Test (PR #132634)

[Lucile Rose Nihlen via llvm-commits]

https://github.com/lnihlen commented:

I think this is a good idea and will allow more people to participate in these kinds of resource/coverage tradeoff discussions. 

https://github.com/llvm/llvm-project/pull/132634