[functorch] Get test_functionalize to run on FB infra (#102695)
A few bits of weirdness needed to happen here:
- skipIfRocm doesn't work as a unittest class decorator; it returns a function,
and the test discovery logic looks for things that inherit from TestCase. So
I wrapped the individual test methods instead.
- Inside fbcode, our test runner (buck + tpx) discovers and runs tests using
two separate processes, so it's important to use @wraps on the generated
class to make it "look like" a regular test.
Differential Revision: [D46344980](https://our.internmc.facebook.com/intern/diff/D46344980/)
**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D46344980/)!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102695
Approved by: https://github.com/zou3519
