fix: openlineage replace dagTree with downstream_task_ids #41587
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related: #41505
Even after fix in #41494 has been implemented, we were still able to cause the scheduler OOM error when creating a dag_tree with the example dag below:
dag crashing the dagTree
To prevent OpenLineage from breaking the scheduler with additional computation, we should only rely on the information that Airflow uses itself - downstream task ids.
This PR removes the dagTree information from OL AirflowJobFacet and adds downstream task ids to the list of tasks included in the same facet. This dramatically reduces the size of the facet and allows the consumer that rely on this information to sill re-create it.
example snippet to re-create
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