[3.11] Enable ruff on several more files in Lib/test (#110929)

[AlexWaygood]

(cherry-picked from commit 02d26c4)

[AlexWaygood]

Note: this PR includes a few changes to Lib/ctypes which aren't strictly necessary, since ruff isn't being run on those files in the 3.11 branch. These changes were automatically cherry-picked by git, since git picked up that Lib/ctypes/test/test_arrays.py was the same file on the 3.11 branch as Lib/test/test_ctypes/test_arrays.py on the main branch. Although these changes aren't strictly necessary, I decided to keep them in the PR, to reduce the risk of future merge conflicts when trying to backport test changes.