* fix(airflow): correctly extract owners from serialized Airflow DAGs
Airflow serialization format wraps tasks under `__var` and `__type`.
Previously, the OpenMetadata Airflow connector failed to extract task owners properly in this format.
This patch:
- Flattens `__var` when parsing task owners
- Fallbacks to `default_args["owner"]` if no task-level owner is explicitly present
- Ensures correct DAG owner is picked as the most common task owner
- Handles compatibility with older Airflow versions
Fixes: #21106
* test(airflow): add tests for owner extraction from serialized Airflow DAGs
Adds new test cases to validate owner extraction logic:
- Owners from serialized task format (`__var`)
- Fallback to `default_args['owner']` if task owners are missing
- Resolution of most common owner
- Compatibility with unstructured or missing owners
* remove test version specific comment
* simplify comments and warnings
* fix return statement
* fixing formatting
* adding handling of default args
* fixing and adding more tests
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