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fix(MonkeyPatch): register undo entry only after a successful mutation (delattr/setitem/delitem) (#14909) - #14910

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fix(MonkeyPatch): register undo entry only after a successful mutation (delattr/setitem/delitem) (#14909)#14910
sharonyao1127 wants to merge 3 commits into
pytest-dev:mainfrom
sharonyao1127:fix-monkey-patch-delattr-setitem-delitem-stale-undo

test(monkeypatch): simplify old-value regression test

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