Change test_invalid_names test to only test constructor of WorkerInfo (#30620)
Summary:
This tests seems to only test that we throw exceptions in the `WorkerInfo` constructor when invalid names are passed in, so I don't think we need to complicate by initializing RPC, and exposing ourselves to potential flakiness.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30620
Differential Revision: D18766955
Pulled By: rohan-varma
fbshipit-source-id: 11643de4d57431e5f46e096c7766de3ab0b9b05a
