[DocDB] RBS: Add retries around FetchData to mask intermittent network failures

[amitanandaiyer]

Jira Link: DB-15563

Description

https://phorge.dev.yugabyte.com/diffusion/YBDB/browse/master/src/yb/tserver/remote_bootstrap_file_downloader.cc$199

Currently in DownloadFile
we do

    FetchDataResponsePB resp;
    auto status = rate_limiter->SendOrReceiveData([this, &req, &resp, &controller]() {
      return proxy_->FetchData(req, &resp, &controller);
    }, [&resp]() { return resp.ByteSize(); });
    RETURN_NOT_OK_UNWIND_PREPEND(status, controller, "Unable to fetch data from remote");

which essentially fails the whole RBS session if there is any intermittent network error during FetchData.

We could add some retries around this to make the RBS more resilient to intermittent errors.

Issue Type

kind/enhancement

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