Revert "Reland #2 "[C10] PG observability hooks. (#108815, #110907)" (#111072)"
This reverts commit bb1424d46e656dfcdd4c12efe58ada9f1720c4d8.
Reverted https://github.com/pytorch/pytorch/pull/111072 on behalf of https://github.com/facebook-github-bot due to Diff reverted internally ([comment](https://github.com/pytorch/pytorch/pull/111072#issuecomment-1765399829))
