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fix: stop priorityQueue from draining while items still pending (#1623)

* fix: priorityQueue drains while items still pending

Priority queue should check if the underlying queue is idle before draining.

Currently the priorityQueue drains if an empty array of tasks is pushed even if other tasks are processing.

* test: adds test for priorityQueue draining before tasks ended

* test: lint fix

* test: adds running assert to drain on test/priorityQueue.js

Co-Authored-By: andrebsguedes <andrebsguedes@gmail.com>

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