Completely remove FutureMessage from FaultyProcessGroupAgent (#50025)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/50025
Test Plan: Imported from OSS
Reviewed By: lw
Differential Revision: D25753587
Pulled By: mrshenli
fbshipit-source-id: a5d4106a10d1b0d3e4c406751795f19af8afd120
