[3.12] gh-109413: libregrtest: enable mypy's --strict-optional
check on most files (#112586)
#112602
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(cherry-picked from commit 70a38ff )
Note: I'm deliberately backporting the entire mypy config file to the 3.12 branch, even though we don't run mypy on
libregrtest
on the 3.12 branch. Having the config file exist on this branch will make future backports easier, even if the file is never actually used on this branch.