fix: unpack unions inside tuples in except handlers #17762
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Diff from mypy_primer, showing the effect of this PR on open source code: mongo-python-driver (https://github.com/mongodb/mongo-python-driver)
+ pymongo/socket_checker.py:82: error: Unused "type: ignore" comment [unused-ignore]
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Fixes #17759
mypy unpacks only top-level unions in except handlers, leaving unions inside tuples unchanged. This leads to the failed check because the Union type isn't a subtype of the BaseException type. We can fix this by simplifying and unpacking types inside tuples.
Before the patch:
After the patch: