[torch/elastic] Add logging to the sanitize function of RendezvousStateHolder (#58169)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58169
This PR adds logging to the `_sanitize()` function of `RendezvousStateHolder` to output the nodes that had no recent heartbeat and are considered "dead".
ghstack-source-id: 128798389
Test Plan: Run the existing tests.
Reviewed By: tierex
Differential Revision: D28333394
fbshipit-source-id: ba0a398a759815e4224b58323c0e743eb383f723
