[3.11] gh-105834: Backport new tests for typing.Protocol
(#105835)
#105860
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(cherry-picked from commit 70c075c)
This actually backports some adjacent tests as well, which currently exist on
main
and3.12
but not on3.11
. These tests weren't part of #105835, but (1) the tests all pass on 3.11; (2) more test coverage never hurts; and (3) backporting these tests will reduce the risk of merge conflicts when backporting test-only PRs in the future.typing.py
#105834