shutil.rmtree accepts asonerror a callback to should expect an exc_info tuple. To move off this, I will add a new kwarg "onexc" which should expect just an exception object.onerror will continue to work for now, but be deprecated.

Linked PRs

• gh-102828: add onexc arg to shutil.rmtree. Deprecate onerror. #102829
• gh-102828: fix test failure (add missing skip instructions) #102835
• gh-102828: emit deprecation warning for onerror arg to shutil.rmtree #102850
• gh-102828: set stacklevel on deprecation warning #103422