[llvm] workflows: Merge LLVM tests together into a single job (PR #78877)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

SGTM. We can always iterate in tree and getting a fix in for that issue is pretty important right now.

https://github.com/llvm/llvm-project/pull/78877