Move type checking outside pre-commit #12866
Draft
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See python/mypy#13916 and https://jaredkhan.com/blog/mypy-pre-commit
I'm basically taking the approach of "Running Mypy correctly outside of Pre-commit" (from the second link) and stopping there since I don't think we gain a lot by shoving mypy into pre-commit.
Keeping this as a draft to showcase all the new errors that mypy is now capable of flagging.