[llvm] [GitHub] Add basic CI for libclang Python binding unit tests (PR #76784)

[Craig Hesling via llvm-commits]

linux4life798 wrote:

A sample run of this action can be seen at https://github.com/linux4life798/llvm-project/actions/runs/7393279920.

https://github.com/llvm/llvm-project/pull/76784