Remove faulty process group code (#61907)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61907
Removing the code for faulty process group agent since it was replaced by faulty tensorpipe agent
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D29794666
Pulled By: H-Huang
fbshipit-source-id: 0b35191cc07220b6774ecacc8d004f25fd2e87f0
