Fix bug in LivyOperator when its trigger times out

[mateuslatrova]

Related issue

closes: #37898

Explain

When a LivyOperator was instantiated with deferrable=True and its batch job ran for more time than the set execution_timeout, airflow would detect this timeout and would cancel the trigger and then try to kill the task with the 'on_kill' method.

But that would fail raising an AttributeError because the batch_id attribute wouldn't be defined in the constructor method.

From now on, the LivyTrigger will timeout itself before airflow does it, and it will send an event to the LivyOperator signaling that a timeout happened. This way, the operator can stop the running Livy batch job, and can fail the task instance gracefully.

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[boring-cyborg]

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