[refactor] Update errorcodes.py: harmonize all of the type annotations #19880
+26
−32
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This completes an in-line todo from 3 years ago relating to a weakness that mypy no longer has (edit: I did not read carefully enough. But I did eventually stumble upon a sufficient workaround for mypyc/mypyc#1142), and removes code with no downside.
There is no need for tests beyond the current CI.