Swap CUDA 10.1 and CPU CI for windows (#57493)
Summary:
This change temporarily disables CUDA testing on PRs, but keeps it on master.
This is likely to increase the number of reverts, but this is necessary as a stop-gap measure to cap the CI costs growth.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57493
Reviewed By: seemethere
Differential Revision: D28162697
Pulled By: janeyx99
fbshipit-source-id: 1bc529a405f7d63c07f4bd9f8ceca8da450743fc
