[NCCL] Modularize ncclCommWatchdog (#46051)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46051
Creates a subroutine for aborting timed out collectives. This should help modularize the ncclCommWatchdog a bit, since it is growing too large.
ghstack-source-id: 114398496
Test Plan:
Successful Flow Run:
f225037915
f217609101
Reviewed By: jiayisuse
Differential Revision: D23607535
fbshipit-source-id: 0b1c9483bcd3a41847fc8c0bf6b22cdba01fb1e6
