[RPC][Better Engineering] Consolidated all rpcAgentRunning atomic booleans (#33915)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33915
Closes: https://github.com/pytorch/pytorch/issues/32963
Test Plan: build bot
Reviewed By: jjlilley
Differential Revision: D20074714
fbshipit-source-id: ee89e76f547a1da71825a317c096176524504290
