SIENTIAPDE-1205

Refactor OpcRepository and update tests for async handling

- Removed the shutdown method from OpcRepository and adjusted the disconnect logic.
- Updated tests in test_activities.py and test_opc.py to support async shutdown functionality.
- Enhanced test cases in test_opc_repository.py to ensure proper async behavior and error handling in OpcRepository methods.

laborious/utils/repository/opc_repository.py

@@ -158,16 +158,6 @@ class OpcRepository():
                 f"Failed to disconnect from OPC server: {e}", self.metadata)
         self.client = None
 
-    def shutdown(self):
-        """
-        Disconnects from the OPC server when the object is destroyed.
-        """
-        try:
-            asyncio.run(self.disconnect())
-        except Exception as e:
-            self.logger.custom_error(
-                f"Error in destructor: {e}", self.metadata)
-
     async def validate_connection(self) -> tuple[bool, dict[str, Any]]:
         """
         Validates the connection to the OPC server using protocol state checking.