Reduce goroutine growth in BackgroundTaskManager - #2266
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Signed-off-by: abushwang <abushwang@tencent.com>
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This PR removes the per-call sleeping goroutine in DonePrioritizedTask() and replaces it with a single scheduler-based mechanism that tracks delayed completions centrally.
It keeps the original silence-period behavior for background tasks, while significantly reducing unnecessary goroutine accumulation under high concurrency and lowering related blocking/lock contention.