Timestamp Embedding Indices Generated for TD (#119955)
Timestamps the generated embedding indices. Moves the old indices to an `archived/` folder and then uploads the index to a `latest/` folder. There will be a short period in between these operations where there is no index in `latest/`. To handle this case, any workflow fetching the index (such as the retriever) should use a retry with backoff when copying from S3.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119955
Approved by: https://github.com/huydhn
