[Improvement][Master] The variables in the code are incorrect and there are ambiguity

[shilei-ly]

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• [X] I had searched in the issues and found no similar feature requirement.

Description

The variable org.apache.dolphinscheduler.service.queue.StandByTaskInstancePriorityQueue#QUEUE_MAX_SIZE in the code needs to be changed to QUEUE_INITIAL_SIZE, because the meaning of this variable is the initial capacity of the queue, not the maximum capacity. The java.util.PriorityQueueis an unbounded queue.

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• [X] Yes I am willing to submit a PR!

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