Improve tests of scitokens
This PR improves the test suite for igwn_auth_utils.scitokens to not use clear=True with mock.patch.dict('os.environ'), it messes with scitokens's ability to place the keycache properly.
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This PR improves the test suite for igwn_auth_utils.scitokens to not use clear=True with mock.patch.dict('os.environ'), it messes with scitokens's ability to place the keycache properly.