Restore rate limit metric distinction #5658
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Description
In #5651 errors where all shards are rate limited were re-qualified from no_shards_error (503) to a rate_limiting_error (429). But rate limiting errors also cover the situation where we unfortunately tried to write to rate limited shards during all 5 workbench retries. We actually need to keep the distinction between the two for troubleshooting reasons, especially in the metrics.
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