SIENTIAPDE-1478

SIENTIAPDE-1478
Enhance end-to-end tests for PredictionsBatch workflow

- Added new test scenarios for input and transform gates handling CONTINUE, STOP, and REPEAT policies.
- Implemented sample data insertion functions for testing various prediction outcomes.
- Updated existing tests to verify behavior under different input conditions and response validations.
- Refactored test structure for clarity and maintainability.

tests/laborious/activities/test_gates.py

@@ -595,7 +595,6 @@ async def test_format_transformed_data_multiple_rows(gates_activity):
     assert len(result['variable']) == 4
     assert len(result['value']) == 4
     assert len(result['model_id']) == 4
-    assert len(result['created_at']) == 4
     assert all(v == 'test_model' for v in result['model_id'].values())
     assert set(result['variable'].values()) == {'var1', 'var2'}
     gates_activity.info.assert_called()