Revert " C10D extension to enable per-thread PG (#86348)"
This reverts commit 97abc21f2bda38e73de2a86da7f43c8126930681.
Reverted https://github.com/pytorch/pytorch/pull/86348 on behalf of https://github.com/huydhn due to Sorry for reverting your PR but it breaks macos tests https://hud.pytorch.org/pytorch/pytorch/commit/97abc21f2bda38e73de2a86da7f43c8126930681
