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Solves T322366.
In !141 (merged), we inadvertently changed the default Spark to Spark3 for all Airflow instances.
This happened because we modified wmf_airflow_common/config/dag_default_args.py, which is used by all instances.
In this MR we revert that behavior to what it was intended:
analytics and analytics_test to Spark3, and research and platform_eng to Spark2.