[DataLoader] Fix tempfile binding and removing for torch_shm_manager (#57566)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57566
Fix the problem that `tempfile` has never been deleted even after `torch_shm_manager` is destroyed.
- The previous implementation has wrong path length for the Linux Socket. It leads to we lose the last character of the name of `tempfile` when bind the pathname to socket. At the end, we can not delete this file due to unexpected file name.
- After we solve the racing problem by introducing a temporary directory, it becomes more dangerous since it prevents `torch_shm_manager` to delete directory as the tempfile persists in the temporary directory.
Test Plan: Imported from OSS
Reviewed By: VitalyFedyunin
Differential Revision: D28202866
Pulled By: ejguan
fbshipit-source-id: 912cfd8fec0cc309d47df223b2b0faa599c60799
