perf: reduce number of concurrent requests

[NoamGaash]

improve performance and reduce load on the API:

1. solve a bug with the retry mechanism - now it will retry less times
2. exponential backoff to the retry mechanism
3. reduce the number of concurrent requests

For more context, see our slack channel https://hasadna.slack.com/archives/C1M8YT5AN/p1731682917019769?thread_ts=1730132257.140449&cid=C1M8YT5AN

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