Deletes a task from this {@link Queue}. Task is identified by taskName.
@param taskName name of the task to delete.
@return True if the task was sucessfully deleted. False if the task was not found or waspreviously deleted.
@throws IllegalArgumentException if the provided name is null, empty or doesn't match theexpected pattern.
@throws InternalFailureException
@throws IllegalStateException If the queue does not exist. (see queue.xml)
@throws TransientFailureException Attempting the request after this exception may succeed.
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