Fix ADF job failure during deferral

[phanikumv]

This PR fixes the below error on AzureDataFactoryRunPipelineOperator when both the deferrable param and wait for termination param are set to True:

[2023-03-23, 06:12:29 UTC] {taskinstance.py:1844} ERROR - Task failed with exception
Traceback (most recent call last):
  File "/opt/airflow/airflow/providers/microsoft/azure/operators/data_factory.py", line 225, in execute_complete
    raise AirflowException(event["message"])
airflow.exceptions.AirflowException: 'NoneType' object has no attribute 'request'

cc @josh-fell

---

^ Add meaningful description above

Read the Pull Request Guidelines for more information.
In case of fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in newsfragments.

[josh-fell]

@phanikumv Would you mind elaborating on how this fixes the error you noticed? It's not entirely obvious to me.

[phanikumv]

@phanikumv Would you mind elaborating on how this fixes the error you noticed? It's not entirely obvious to me.

It's similar to the issue mentioned here odrling/peony-twitter#41 , the client session if initialized in context manager doesnt work as expected as the asyncio session object is getting closed before the task gets completed. The context manager exit is called before code in the body.

When I move the client creation outside context manager - it works flawlessly. PFB a screenshot of successful task runs after this change

[josh-fell]

Thanks for the extra context @phanikumv!