ingest/ledgerbackend: Rerun BufferedStorageBackend benchmark tests

[urvisavla]

What problem does your feature solve?

In #5390 , we ran performance benchmark tests on BufferedStorageBackend for ledger metadata files using different batch sizes to determine the optimal configuration. Since then, a fix has been made to the XDR library used for unmarshalling the downloaded files. We should re-run these benchmark tests with the fix and update configuration recommendations for BufferedStorageBackend.

What would you like to see?

Rerun benchmark tests and Adjust default Configurations based on the results.

What alternatives are there?

Let SDK users to figure out the best configurations based on their own experimentation as needed.