Enable python code coverage on windows (#44548)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/43897
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44548
Reviewed By: walterddr
Differential Revision: D24582777
Pulled By: malfet
fbshipit-source-id: 9b68b72ba356fef61461fc2446c73360f67ce0b4
