Revert "[NCCL][CUDA][CUDA Graphs] Flush enqueued work before starting a graph capture (#104487)"
This reverts commit db63bf3d7e5eef320dde9c2d4b7976eb5fcddbd6.
Reverted https://github.com/pytorch/pytorch/pull/104487 on behalf of https://github.com/huydhn due to Sorry for reverting you change, it is failing internal build ([comment](https://github.com/pytorch/pytorch/pull/104487#issuecomment-1707055346))
