Removed the asynchronous MigrationTaskInjector::deleteAllTasks as we cleanly
wait for the end of execution pipeline draining in all cases in MigrationTaskInjector::WorkerThread::run. The asynchronous deleteAllTasks deleted the end-of-session signaling to the task injector, which led this end of MigrationTaskInjector::WorkerThread::run into infinte waiting for this dropped end of session signal.
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