Revert "Move win-vs2019 build and test to unstable (#100281)"
This reverts commit 999e17d80a8107e88c92a1019e3d7aff1d740e8c.
Reverted https://github.com/pytorch/pytorch/pull/100281 on behalf of https://github.com/malfet due to All runners has been updated ([comment](https://github.com/pytorch/pytorch/pull/100281#issuecomment-1528622556))
