Port tests away from setUpClass and setUpModule to setUp alone. #25774
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Port tests away from setUpClass and setUpModule to setUp alone.
This change prepares for upcoming changes in which we run tests in parallel using threads, which we are doing partially to test free threading but also partially to speed up TPU tests via thread-parallelism.
If independent tests run in parallel in no particular order, there's no natural scope around which to call setUpClass or SetUpModule. But for JAX tests this never seems necessary: we can just do the same work in setUp() or do it globally.