NCCL and other backend PG timeout 30min -> 10min (#8253)
Apparently nccl/pytorch switched to a 10min collective timeout (from the
original 30min) in 2024 (torch==2.2) but ds is at 30min still - should
we sync with the more realistic timeout? 30min is a way too long, no
collective takes more than 10min these days
This change applies to all backends, even though pytorch changed the
default for nccl only - since it's a sensible modern upgrade.
