SIENTIAPDE-1273

Refactor Drift class to improve target name handling

- Extracted target name from model configuration in the Drift class for better clarity and maintainability.
- Updated test cases to reflect changes in input data structure, ensuring consistency in target name retrieval.

tests/laborious/workflows/test_drift.py

@@ -34,7 +34,7 @@ async def test_run(workflow_mock: AsyncMock, drift: Drift):
         'source_table_name': 'test_source_table',
         'target_table_name': 'test_target_table',
         'interval': 60,
-        'target_name': 'test_target',
+        'model_config': {'target': 'test_target'},
         'drift_metrics': ['psi', 'ks'],
         'chunk_period': 'hour',
     }