Make `bool(NotImplemented)` into an error

[JelleZijlstra]

See https://discuss.python.org/t/should-bool-notimplemented-become-an-error/51342 and #79893.

Linked PRs

• gh-118767: Make bool(NotImplemented) raise TypeError #118775
• gh-118767: Improve tests and docs for bool(NotImplemented) #118813