SIENTIAPDE-1478

Enhance end-to-end tests for PredictionsBatch workflow scenarios

- Introduced mock repositories for PI Web API and OPC operations to improve test coverage.
- Updated test scenarios to handle partial write errors for PI Web API and OPC.
- Refactored existing tests to assert correct behavior under various error conditions.
- Enhanced logging and error handling in API and OPC activities to provide clearer feedback on failures.
- Removed outdated integration test file to streamline test suite.

laborious/activities/opc.py

@@ -352,10 +352,13 @@ class OPC(SientiaMonitoring):
             This allows downstream systems to handle data quality appropriately.
         """
 
+        message = 'Some data could not be written to OPC servers'
+
         if not success:
             data['prediction_confidence'] = OPC_WRITTING_ERROR_CONFIDENCE
+            data['comments'] = message
             self.debug(
-                f'Some data could not be written to OPC servers, setting confidence to  {OPC_WRITTING_ERROR_CONFIDENCE}.',
+                f'{message}, setting confidence to  {OPC_WRITTING_ERROR_CONFIDENCE}.',
                 metadata,
             )