Collective dispatching from Process Group (#91257)
Fixes https://github.com/pytorch/pytorch/issues/90932
Fixes https://github.com/pytorch/pytorch/issues/90659
Remove redundant collection operation definitions by calling the ops directly from `ProcessGroup`
Context:
https://github.com/pytorch/pytorch/issues/86225
Differential Revision: [D42854676](https://our.internmc.facebook.com/intern/diff/D42854676)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91257
Approved by: https://github.com/kwen2501
