Remove VS install step unless necessary from GHA Windows workflows (#60791)
Summary:
~~This should only be merged after our AMI has been deployed after https://github.com/fairinternal/pytorch-gha-infra/pull/1. (And will likely fail our current windows jobs)~~
I have revised this PR to install VS only when it's not already installed.
This should save ~5min per Windows workflow.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60791
Reviewed By: soulitzer
Differential Revision: D29643876
Pulled By: janeyx99
fbshipit-source-id: 4bcfaf5bcad9e5636a1624c3e799e7cc97a87660
