Add more functorch shards to PR CI (#82013)
This includes a configuration for linux CUDA, which will give us enough
test coverage for functorch to confidently begin accepting PRs to it again.
NB: Previously it turns out that some tests were not being skipped, even
though we added a skip decorator.
Test Plan:
- wait for CI
- check that the tests being skipped with a skip decorator are actually
skipped via reading test logs
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82013
Approved by: https://github.com/janeyx99
