fix: Properly disconnect from OPC-UA in case of failure (#3707)

Author: dominikriemer

streampipes-extensions/streampipes-connectors-opcua/src/main/java/org/apache/streampipes/extensions/connectors/opcua/client/SpOpcUaClient.java

@@ -53,7 +53,12 @@ public ConnectedOpcUaClient connect()
     OpcUaClientConfig clientConfig = new MiloOpcUaConfigurationProvider().makeClientConfig(spOpcConfig);
     var client = OpcUaClient.create(clientConfig);
     client.addSessionInitializer(new DataTypeDictionarySessionInitializer(new GenericBsdParser()));
-    client.connect().get();
-    return new ConnectedOpcUaClient(client);
+    try {
+      client.connect().get();
+      return new ConnectedOpcUaClient(client);
+    } catch (Exception e) {
+      client.disconnect().get();
+      throw e;
+    }
   }
 }