Release GIL before destructing ProcessGroup classes (#56381)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56381
Part of fix for https://github.com/pytorch/pytorch/issues/56297
ghstack-source-id: 126943449
Test Plan: sandcastle
Reviewed By: zhaojuanmao
Differential Revision: D27855337
fbshipit-source-id: 88bc9234685a6637318e35b25fa68ccbdc3cbc12
