change enterprise dashboard environment to hidden

Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: tischrei <tino.schreiber@t-systems.com>
Co-committed-by: tischrei <tino.schreiber@t-systems.com>

otc_metadata/data/services.yaml

@@ -1542,7 +1542,7 @@ services:
     service_title: Enterprise Dashboard
     service_type: ed
     service_uri: enterprise-dashboard/umn
-    environment: public
+    environment: hidden
     teams:
       - name: docs-dashboard-rw
         permission: write