add retry logic to API

[f0reachARR]

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[gemini-code-assist]

Code Review

This pull request refactors S3 metadata retrieval by moving retry logic from the storage service into the submissions route handler and simplifying the service method. Feedback highlights that the new retry implementation is inefficient because it catches all errors instead of specific retryable ones, and that moving this logic out of the service layer reduces modularity. Additionally, the removal of unit tests for the retry mechanism was flagged as a regression in test coverage.