[aggregator|tcpclient] Drop enqueued payloads for a flush after write fails #4116
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What this PR does / why we need it:
If an instance is slow/dead and writes (with retries) fail, don't just abort flush - drop all enqueued payloads (captured at the time of Flush()). Otherwise, the backlog is accumulating up to the point the queue is dropping upstream and causes even more load on the target aggregator instance the next flush cycle.
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