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

[Dmitry Vasilyev via cfe-commits]

slydiman wrote:

> First Windows CI results: LLDB unit tests do not even build.

Please note the following for Windows setup:

- We used cmake 3.25.3 because we got some issues with the latest cmake.
- python prerequisites are: `python -m pip install swig pexpect psutil`.
- Most gnu tools may be used from `git` distributive, PATH env must contain C:\Program Files\Git\usr\bin
- lldb API tests require `make` which can be installed via Chocolatey `choco install make`.
- lldb for Windows host must be compiled with `CMAKE_MSVC_RUNTIME_LIBRARY=MultiThreadedDLL` (or MultiThreadedDebugDLL in case of CMAKE_BUILD_TYPE=Debug), otherwise python and lldb will use different UCRT instances and python will crash with the exit code 0xC0000409 (STATUS_STACK_BUFFER_OVERRUN) because of an assert in UCRT.

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