[7.17] Ensure tasks with banned parents always get cancelled (#90188) #90248
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The check used to entirely skip parent lookup relies on ConcurrentHashMap#isEmpty() which could return inconsistent results, and potentially skip the cancellation of a task with a banned parent upon registration, and it doesn't seem to have a benefit considering the hash code computation. Closes elastic#88201
pxsalehi
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>test
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Cherry-pick #90188