Apache Airflow version: 2.0.0

Kubernetes version (if you are using kubernetes) (use kubectl version):
Not relevant

Environment:
Not relevant

What happened:

BranchPythonOperator performs xcom push by default since this is the behavior of PythonOperator.
However BaseBranchOperator doesn't do xcom push.

Note: It's impossible to push to xcom manually because the B

Summary

It's not obvious that users can tag solids and pipelines. We should at least update this example to mention solid level tags or include a solid tag example

Reproduction

Dagit UI/UX Issue Screenshots

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