.circleci: Remove Windows workflows from Circle (#64959)
Summary:
Removes Windows CI from Circle
Will go in after https://github.com/pytorch/pytorch/pull/65094
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64959
Reviewed By: soulitzer
Differential Revision: D31095374
Pulled By: janeyx99
fbshipit-source-id: b0d13a59aa8c6e2f85dbd9c343cac395c4e64475
