[draft](tablet scheduler) fix higher priority tablet add failed due to pending queue full #41076
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When tablet checker search for unhealth tablets, it will search table one by one. If the pending queue is full, then the later search tablets couldn't add into the pending queue, even if they are higher priorty. So we use a minmax queue to holding the tablets. If a tablet is higher priority and the pending queue is full, it will envit the lowest priority tablet in the queue, then add this tablet into queue;