Clear frame locals and stack on generator close + Add dir_fd support for rmdir, remove/unlink, scandir by youknowone · Pull Request #7222 · RustPython/RustPython

…for rmdir, remove/unlink, scandir (RustPython#7222)

* Clear frame locals and stack on generator close

Add Frame::clear_locals_and_stack() to release references held by
closed generators/coroutines, matching _PyFrame_ClearLocals behavior.
Call it from Coro::close() after marking the coroutine as closed.

Update test_generators.py expectedFailure markers accordingly.

* Add dir_fd support for rmdir, remove/unlink, scandir

- rmdir: use unlinkat(fd, path, AT_REMOVEDIR) when dir_fd given
- remove/unlink: use unlinkat(fd, path, 0) when dir_fd given
- scandir: accept fd via fdopendir, add ScandirIteratorFd
- listdir: rewrite fd path to use raw readdir instead of nix::dir::Dir
- DirEntry: add d_type and dir_fd fields for fd-based scandir
- Update supports_fd/supports_dir_fd entries accordingly

* cells_free