3707 Kusto Icon Fix (#12621)

* 3707 Changed getIconpath in serverTreeRenderer to always set iconPath if iconId is undefined. Changed renderConnection to always renderServerIcon

* 3707 Added default flag to KustoIcon in package.json

* fix caching issue

* 3707 Changed default to optional variable. Updated asyncServerTreeRenderer > getIconPath to check for default

* 3707 Changed logic for setting iconPath in getIconPath

Co-authored-by: chgagnon <chgagnon@microsoft.com>

extensions/kusto/package.json

@@ -223,7 +223,8 @@
           "path": {
             "light": "resources/light/azureDE.svg",
             "dark": "resources/dark/azureDE_inverse.svg"
-          }
+          },
+          "default": true
         },
         {
           "id": "kusto:cluster",