Add GitHub Actions workflow to test tools (#54207)
Summary:
This PR closes https://github.com/pytorch/pytorch/issues/52866 by adding a GitHub Actions workflow to run the tests in the dir introduced by https://github.com/pytorch/pytorch/issues/53755. It also uses `actions/setup-python@v2`, assuming that https://github.com/pytorch/pytorch/issues/54202 will be merged.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54207
Test Plan: The added "Test tools" GHA workflow in CI.
Reviewed By: walterddr
Differential Revision: D27135159
Pulled By: samestep
fbshipit-source-id: c8c5e2e2ac2491baab1b1f1ed4f44b4c3266ee8d
