[NCCL] Enable send/recv tests (#45994)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45994
Send/Recv tests were disabled because of the https://github.com/pytorch/pytorch/issues/42517. With that issue fixed, this diff enables those tests.
ghstack-source-id: 113970569
Test Plan: waitforsandcastle
Reviewed By: jiayisuse
Differential Revision: D24172484
fbshipit-source-id: 7492ee2e9bf88840c0d0086003ce8e99995aeb91
