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

[Aaron Ballman via llvm-commits]

AaronBallman wrote:

> FYI in the libc++ CI we've been running the LLDB tests for a few months now and I haven't seen a single unrelated failure.

Thanks, that's really useful information!

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