Add Ruff rules to ban Core imports from Task SDK internals

[amoghrajesh]

Body

Airflow Core imports from Task SDK internal modules, creating unwanted coupling.

Add Ruff banned-api rules to prevent core from importing SDK internals. (https://docs.astral.sh/ruff/rules/banned-api/).

Committer

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

[potiuk]

Nice. Yeah useful, and it will also be tested automatically during tests as second line of defense. When Task-sdk will not have "airflow-core" as dependency, uv sync before running tests will remove airflow-core from the PYTHOPATH and any imports of airflow will fail.

[amoghrajesh]

That's nice, thanks for sharing @potiuk! Working on a POC for this one.

[amoghrajesh]

Completed via: #53700