[testing] Pass verbosity settings to `XMLTestRunner` (#35224)
Summary:
When `unittest.main()` is invoked with custom testRunner, verbosity settings for the runner must be set manually
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35224
Test Plan: CI
Differential Revision: D20605896
Pulled By: malfet
fbshipit-source-id: 79fc6f55911189b6d8a4bc83bd2390c94bd69e5e
