[lldb] Suppport testing with debug-python on Windows (#140443)

When trying to run the LLDB API tests on Windows with a debug
configuration, they fail, because the `_lldb` module won't be found. As
explained in https://github.com/llvm/llvm-project/issues/51272, this is
because lit will run the test with `python.exe` but the module is built
for the debug version of python, `python_d.exe`.

CMake already resolved the debug executable in
`Python3_EXECUTABLE_DEBUG`, so this PR changes the
`config.python_executable` to point to `python_d.exe` on Windows in
debug mode.

The check is equivalent to the one done in the top-level LLDB CMakeLists
[when setting the python
suffix](https://github.com/llvm/llvm-project/blob/3ccb15d6caf57f2a866d496ada2fb52d14b179d2/lldb/CMakeLists.txt#L79-L86).

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