[ci] fix bug in win build artifact uploading
We were uploading artifacts with a blank string as the name. Properly
set the name using `inputs.build-environment`.
This actually happened to work, because we only have one windows
artifact per workflow and so the name `""` never collided lol.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/80042
Approved by: https://github.com/malfet, https://github.com/seemethere, https://github.com/janeyx99
