[BE] Move remaining workflows off Xenial (#87834)
Both BE and prerequisite for moving our CI/CD to C++17 compiler (gcc-5.4
is not fully C++17 compliant)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87834
Approved by: https://github.com/weiwangmeta, https://github.com/kit1980, https://github.com/huydhn
