[llvm] [libc] Exercise all CMake build types in GitHub Action workflows (PR #126315)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

This should be fine, but we do need to be careful that we don't exceed the Github actions queue and make actions related to other workflows wait. I don't think this will be an issue given the release tests are done on Buildkite (migrating to GHA soonish on self hosted runners) and that they're pretty short, just something we need to be mindful of.

(In terms of specifics, we can have up to 60 actions executing at the same time on the hosted Github runners).

https://github.com/llvm/llvm-project/pull/126315