Adjust local dev docker compose for AF 3

[neel-astro]

This issue is to track the changes required to the local dev's docker-compose file to be functional with the upcoming Airflow 3.

Changes identified until now:

• airflow db upgrade command has been dropped in favour of airflow db migrate
• CLI local dev logic should bring up Fast API server
• Spin up separate DAG Processor container

[vishwas-astro]

@neel-astro @robshea-astro it will be good to attach this to an airflow 3 related milestone too

[jedcunningham]

We should use migrate for all Airflow versions 2.7+, that's when upgrade was deprecated.

[neel-astro]

Closing this as it has been completed as released as part of 1.34.0