[clang] [llvm] [clang][python][test] Move python binding tests to lit framework (PR #142948)

[Jannick Kremer via cfe-commits]

DeinAlptraum wrote:

I've tested around a bit more and read up on the Github Actions docs, the takeaways are as follows
1. The reason that the libclang CI doesn't run is not that the file syntax is wrong (we'd still get a failed run complaining about syntax issues if that were the case). Rather, it seems that sometimes, workflows are not triggered if there's a conflict. Not that it matters right now since the workflow would fail with a syntax error anyway, but once we figured the problem out, you'll have to resolve the conflict for the CI to run.
2. `llvm-project-tests` is not an action, but a reusable workflow. It is not possible to add additional steps after calling a reusable workflow, so we'd have to either roll our own implementation to build the `libclang` cmake target in the CI, or change `llvm-project-tests` into an action so it can be used here. Imo the latter option is preferable, but as this also affects others using that workflow, I've opened a topic on Discourse to ask for feedback: https://discourse.llvm.org/t/github-actions-ci-should-the-llvm-project-tests-workflow-be-turned-into-an-action/87052

https://github.com/llvm/llvm-project/pull/142948