Disallow --unique alongside --ignore-cases in file-contents-sorter #1095
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Closes #794: using these flags at the same time results in undefined behavior - the final ordering is not guaranteed as --unique breaks sorting due to passing the contents through a set.
NOTE: I added a newline before and after the mutex group to be consistent with other usages of mutex groups (e.g., check_builtin_literals.py) in this repo.