SIENTIAPDE-1478

Refactor validation script and improve logging in API and model repository

- Updated validation script to include 'e2e/' directory in code formatting and linting checks.
- Enhanced error logging in API class to improve readability of error messages.
- Refactored debug logging in model repository for better structured output.
- Cleaned up import statements in various files for improved organization.

tests/laborious/utils/repository/test_model_repository.py

@@ -812,7 +812,14 @@ async def test_fit_models_not_df_target_name_none_and_not_in_model(
     data = MagicMock()
 
     output = await mlflow_repository.fit_models(
-        'model_name', data, 'latest_production_id', metadata['metadata'], 'sklearn', False, 'pyfunc', None
+        'model_name',
+        data,
+        'latest_production_id',
+        metadata['metadata'],
+        'sklearn',
+        False,
+        'pyfunc',
+        None,
     )
 
     mlflow_repository.download_model.assert_has_calls(