fix: nginx config and namespace in bootdata

devenv/frontend-service/local-cloud-shim/mock-data/bootdata.json

@@ -35,6 +35,7 @@
     }
   },
   "settings": {
+    "namespace": "stacks-11",
     "defaultDatasource": "-- Grafana --",
     "datasources": {},
     "minRefreshInterval": "5s",

devenv/frontend-service/local-cloud-shim/nginx.conf

@@ -112,7 +112,7 @@ server {
 
     proxy_http_version 1.1;
     proxy_set_header Upgrade $http_upgrade;
-    proxy_set_header Connection "upgrade";
+    proxy_set_header Connection $connection_upgrade;
   }
 
   # Everything else to the frontend