Revert D28981443: reland D28645531: .github: Add Windows GPU workflow
Test Plan: revert-hammer
Differential Revision:
D28981443 (https://github.com/pytorch/pytorch/commit/21121675b3ebaf40738535dabf2e0bdf69670700)
Original commit changeset: 5d24cccfb8c8
fbshipit-source-id: 14e5b610978882bace2f834f61e5457f62b11290
