SIENTIAPDE-994Add shutdown methods for Activities and OPC classes; enhance worker error handling

laborious/activities/activities.py

@@ -47,3 +47,7 @@ class Activities(Postgres, MLFlow, Gates, OPC):
     @activity.defn(name="prepare_activity")
     async def prepare_activity(self, input_data: dict[str, Any]):
         await super().prepare_activity(input_data)
+
+    def shutdown(self):
+        Postgres.close(self)
+        OPC.shutdown(self)

laborious/activities/opc.py

@@ -99,3 +99,7 @@ class OPC(BaseActivity):
                         data_type=tag_config['data_type'],
                         tag_type='confidence'
                     )
+
+    def shutdown(self):
+        for opc in self.opc_repository.values():
+            opc.disconnect()