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

[Vlad Serebrennikov via llvm-commits]

Endilll wrote:

@Michael137 This is for Linux. Windows works the same way just below those lines: https://github.com/llvm/llvm-project/blob/9a7bd8a60f03595be5d42315790df6d409f81091/.ci/generate-buildkite-pipeline-premerge#L253-L255

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