Fix the queue tree from resolving in between the testcase.

[garg3133]

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• ❌ No modified files found in the types directory.
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[garg3133]

This does not work well with some hooks because for the this.runFn() (in lib/testsuite/runnable.js) to resolve for some hooks, the queue:finished event must be emitted from the done() method in lib/core/queue.js. But, in this implementation, the done() method of queue would never reach the this.emit() line because the done() function of asynctree.js wouldn't run (and clear the tree) until the this.runFn() is resolved (and this.currentResult.settled is set to true).

So, a situation of deadlock arises and the test run gets stuck.

[garg3133]

#4325 is a better version of this.