kong_overview_openmetrics_v3 (DataDog#20752)

* Create kong_overview_openmetrics_v3

* updates on Kong dashboard

Co-authored-by: Sarah Witt <sarah.witt@datadoghq.com>

* update dashboard for kong metrics <v3

* update dashboard title for <v3

* Add updated dashbaord to manifest

* update v3 dashboard title

---------

Co-authored-by: Sarah Witt <sarah.witt@datadoghq.com>

Author: Janaeq

kong/assets/dashboards/kong_overview_openmetrics.json

@@ -10,7 +10,7 @@
             "prefix": ""
         }
     ],
-    "title": "Kong Overview [OpenMetrics]",
+    "title": "Kong Overview (<V3) [OpenMetrics]",
     "widgets": [
         {
             "definition": {