[7/N] Remove fork tests for RPC. (#63443)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63443
After https://github.com/pytorch/pytorch/pull/63442, all distributed
tests can run with opt-asan. As a result, we can now remove all of our fork
based tests.
This is the first PR in a stack, which first removes fork based tests from RPC.
ghstack-source-id: 136177744
Test Plan: waitforbuildbot
Reviewed By: lw
Differential Revision: D30384905
fbshipit-source-id: 86d438aebaa6cb02ae2a966fea244849849a1889
