[CI] Move parallel native builds to 3.8 (#93103)
As well as nightly docs builds
Followup after https://github.com/pytorch/pytorch/pull/92928
Pull Request resolved: https://github.com/pytorch/pytorch/pull/93103
Approved by: https://github.com/clee2000, https://github.com/huydhn, https://github.com/kit1980
