Enable Ruff ANN2 (flake8-annotations, autofixes only) #13331
Merged
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Ref #13295
https://docs.astral.sh/ruff/rules/#flake8-annotations-ann
When writing scripts and tests, I often forget to include the return type of functions.
Due to the way our mypy configs are currently setup, that doesn't show up in my editor.
This PR solves that (missing return types in non-stubs files show up in editor) and single-file statically analysable cases can be autofixed.