Add compatibility tests for executors

[shahar1]

Body

See: #65752 (comment)

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.

[leeyspaul]

I can look into this one. I’ll start with the Celery case from #65752 and see where executor tests fit into the existing provider compatibility test setup. I’ll keep the first pass small and check back in here with updates.