Improve airflow dags and testing

[noel]

No description provided.

[github-actions]

⚠️ Test Warnings Detected:

• /__w/balboa/balboa/orchestrate/dags/bad_variable_usage.py has Variable usage outside @task decorated functions at: [(7, 20)]
• /__w/balboa/balboa/orchestrate/dags/other_examples/datacoves_sample_dag.py has Variable usage outside @task decorated functions at: [(10, 7), (11, 7), (12, 7)]

[github-actions]

⚠️ Test Warnings Detected:

Tests Summary:
Total Tests: 50
Passed: 47
Failed: 3

Warnings:
- datacoves_bluegreen_dag in other_examples/blue_green_dag.py should have task retries >= 3 it currently has 1.