[GHA] attempt to re-enable mac test workflows (#78000) (#78749)
Our mac tests have not been running since #77645 because of
<img width="1386" alt="image" src="https://user-images.githubusercontent.com/31798555/169602783-988a265a-ce4a-41a7-8f13-3eb4615b0d6f.png">
https://github.com/pytorch/pytorch/actions/runs/2345334995
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78000
Approved by: https://github.com/malfet
Co-authored-by: Jane Xu <janeyx@fb.com>
