Run Task SDK tests without DB

[kaxil]

We don't need Database for Task SDK. So let's skip initializing or using the database. This will help us catch if there is a code that needs DB leaks in the SDK code

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[kaxil]

Hmmm, could this be done in the task_sdk/tests/conftest.py too somehow, so that if you run pytest it will also not spin up the DB?

I think there is a marker we could apply globally via that file.

@ashb Done

[kaxil]

~Waiting for https://github.com/apache/airflow/pull/43185 to get merged first~

Update: Its Merged