Infinite timeout for operations against ProcessGroup for RPC (#38577)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38577
We don't want to limit a timeout to 30 min since there could be no
operations within that time frame. Bump to 2^31 - 1 (int32 max)
ghstack-source-id: 104743727
Test Plan: CI
Differential Revision: D21602425
fbshipit-source-id: ab002262f01664b538761202b3bd7584fcee3c6b
