[BUG] examples/airflow tutorial no longer producing expected lineage graph

[merobi-hub]

The DAGs in this tutorial are producing different graphs than one expects. For example, currently counter.inc is in a single-node graph, but one expects two datasets and one additional job there.

There have been many changes to Marquez, OpenLineage and Airflow since this was written, so it's not surprising that it no longer works perfectly.