[lldb] Fix pid_t redefinition on Windows in ScriptInterpreterPythonInterfaces (#181493)
## Summary
Include `lldb-python.h` as the first include inside the
`LLDB_ENABLE_PYTHON` block in `ScriptInterpreterPythonInterfaces.cpp`,
matching the pattern used by every other Python interface `.cpp` file in
this directory.
On Windows, `lldb-python.h` defines `NO_PID_T` before including
`Python.h`. This prevents `PosixApi.h` (transitively included via
`lldb-private.h`) from redefining `pid_t` with a conflicting type
(`uint32_t` vs `int`).
The issue was introduced by #181334 (ScriptedSymbolLocator plugin),
which added a new header whose include chain transitively reaches
`PosixApi.h`.
Fixes Windows build failures on lldb-aarch64-windows, lldb-x86_64-win,
and lldb-remote-linux-win.
## Test plan
- [ ] lldb-aarch64-windows build passes
- [ ] lldb-x86_64-win build passes
- [ ] lldb-remote-linux-win build passes
Co-authored-by: Rahul Reddy Chamala <rachamal@meta.com>