[ResponseOps] Document creating task-manager serverless monitoring assets - adding to kibana dev docs navigation (#210902)

## Summary

This PR adds the new docs to the Kibana dev docs nav

dev_docs/nav-kibana-dev.docnav.json

@@ -237,6 +237,9 @@
         },
         {
           "id": "kibDevTutorialsSolutionNavigation"
+        },
+        {
+          "id": "kbServerlessTaskManagerMonitoring"
         }
       ]
     },