[llvm] [lldb] Stop testing LLDB on Clang changes in pre-commit CI (PR #95537)

[Aaron Ballman via llvm-commits]

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

I'm okay with this as a stopgap measure. @JDevlieghere, are you okay with this as well?

https://github.com/llvm/llvm-project/pull/95537