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Add tests for airflow dags

Gmodena requested to merge T293382-dags-testing into multi-project-dags-repo

This PR adds the capability to test Airflow DAG instances via pytest, as described in [SPIKE] Investigate Different CI Checks.

What changes with this PR

A new test suite for DAG integrity testing has been added.

Integrity testing

The tests/dags/ suite performs validation of all DAG modules in the repo; it follows a recommended validation practice described in ensure that your DAG objects are defined correctly, acyclic, and free from import errors.

The suite can be triggered via: make test_dags.

Note: dags/ contains side effects that cause the test to (correctly) fail. We should get rid of in e.g. T292740. We could xfails() or skip() the suite before merging.

Edited by Gmodena

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