GH-73991: Use same signature for shutil._rmtree_[un]safe().
#120517
Merged
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Preparatory work for moving
_rmtree_unsafe()and_rmtree_safe_fd()topathlib._osso that they can be used from bothshutilandpathlib.Move implementation-specific setup from
rmtree()into the safe/unsafe functions, and give them the same signature(path, dir_fd, onexc).In the tests, mock
os.openrather than_rmtree_safe_fd()to ensure the FD-based walk is used, and replace a couple references toshutil._use_fd_functionswithshutil.rmtree.avoids_symlink_attacks(which has the same value).No change of behaviour.