Separate faulty agent RPC tests (#79810)
Separates faulty agent RPC tests from rpc_test.py to faulty_agent_rpc_test.py towards fixing issue #78367.
Run a specific test:
cpurun pytest test/distributed/rpc/test_faulty_agent.py -vsk <test_name>
Run all FaultyAgentRpcTests:
cpurun pytest test/distributed/rpc/test_faulty_agent.py -vs
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79810
Approved by: https://github.com/H-Huang
