[3.10] gh-102721: Improve coverage of _collections_abc._CallableGenericAlias
#102790
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This is a manual backport of #102722 but without
typing.py
changes and withoutTypeVarTuple
case, because it was added in 3.11_collections_abc._CallableGenericAlias
#102721Automerge-Triggered-By: GH:AlexWaygood