[clang] [llvm] Enable LLDB tests in Linux pre-merge CI (PR #94208)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

@AaronBallman @JDevlieghere @Michael137 @adrian-prantl @DavidSpickett @mizvekov I updated the PR to test LLDB on Clang changes. I hope we can start gathering approvals to get this PR moving.

https://github.com/llvm/llvm-project/pull/94208