[Replicate] Add unit test with replicate param names (#102401)
This attribute wasn't actually used in tests, add a test ensuring that
if replicate is used on top of FSDP, the replicated parameter names are as
expected.
TODO: there are a few ways to check if module is managed by composable API,
such as replicated param names for replicate, _get_module_state API,
_get_registry_api, etc. We should unify all composable APIs to check in a
unified way (filed an issue)
Differential Revision: [D46236377](https://our.internmc.facebook.com/intern/diff/D46236377/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102401
Approved by: https://github.com/awgu
