Revert D22103662: [NCCL] Explicitly Abort NCCL Communicators on Process Group Destruction
Test Plan: revert-hammer
Differential Revision:
D22103662 (https://github.com/pytorch/pytorch/commit/527ab13436c059631b18630d58b7fdbaf67686f3)
Original commit changeset: 1f6f88b56bd7
fbshipit-source-id: d0944462c021ec73c7f883f98609fc4a3408efd9
