[3.13] gh-126451: Revert backports of ABC registrations for `contextvars.Context` and multiprocessing proxies#126734

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AlexWaygood merged 2 commits intopython:3.13from

AlexWaygood:revert-backports

Nov 12, 2024

Commits on Nov 12, 2024

Revert "[3.13] gh-126451: Register contextvars.Context to collections.abc.Mapping (GH-126452) (#126518)"
AlexWaygood
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Revert "[3.13] gh-126417: Register multiprocessing proxy types to an appropriate collections.abc class (#126419) (#126435)"
AlexWaygood
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