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

[David Spickett via cfe-commits]

DavidSpickett wrote:

> MSVC 14.29.30133 is VS 2019. We are using VS 2022 with the latest Windows SDK to build lldb w/o problems.

I also couldn't reproduce it locally with `19.34.31937`, but I may still be able to reproduce by making my own version of this PR so I can use the CI's version.

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