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

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

Linux results are ready. `SymbolFile/DWARF/x86/module-ownership.mm` is crashing.
While unresolved tests are not considered failed, if you grep for `FAILED`, they add a lot of noise that would make harder for people to realize what the actual reason for CI failure.
All in all, I consider LLDB tests not to be in a good enough shape to add them to our CI in their entirety. Enabling known good subsets is an option, though.
https://buildkite.com/llvm-project/github-pull-requests/builds/69210#018fddab-f349-4495-b5fa-7fa2c329a73f
```
Unresolved Tests (21):
  lldb-api :: commands/expression/multiline-completion/TestMultilineCompletion.py
  lldb-api :: commands/expression/multiline-navigation/TestMultilineNavigation.py
  lldb-api :: commands/gui/basic/TestGuiBasic.py
  lldb-api :: commands/gui/breakpoints/TestGuiBreakpoints.py
  lldb-api :: commands/gui/spawn-threads/TestGuiSpawnThreads.py
  lldb-api :: commands/gui/viewlarge/TestGuiViewLarge.py
  lldb-api :: driver/batch_mode/TestBatchMode.py
  lldb-api :: driver/job_control/TestJobControl.py
  lldb-api :: driver/quit_speed/TestQuitWithProcess.py
  lldb-api :: functionalities/breakpoint/breakpoint_callback_command_source/TestBreakpointCallbackCommandSource.py
  lldb-api :: functionalities/progress_reporting/TestTrimmedProgressReporting.py
  lldb-api :: iohandler/autosuggestion/TestAutosuggestion.py
  lldb-api :: iohandler/completion/TestIOHandlerCompletion.py
  lldb-api :: iohandler/resize/TestIOHandlerResize.py
  lldb-api :: iohandler/sigint/TestIOHandlerPythonREPLSigint.py
  lldb-api :: iohandler/sigint/TestProcessIOHandlerInterrupt.py
  lldb-api :: iohandler/stdio/TestIOHandlerProcessSTDIO.py
  lldb-api :: iohandler/unicode/TestUnicode.py
  lldb-api :: repl/clang/TestClangREPL.py
  lldb-api :: terminal/TestEditline.py
  lldb-api :: terminal/TestSTTYBeforeAndAfter.py

********************
Failed Tests (1):
  lldb-shell :: SymbolFile/DWARF/x86/module-ownership.mm
```

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