Panels: remove beta flag from stat and bargauge panels (#30324)

public/app/plugins/panel/bargauge/plugin.json

@@ -2,7 +2,6 @@
   "type": "panel",
   "name": "Bar gauge",
   "id": "bargauge",
-  "state": "beta",
 
   "info": {
     "author": {

public/app/plugins/panel/stat/plugin.json

@@ -2,7 +2,6 @@
   "type": "panel",
   "name": "Stat",
   "id": "stat",
-  "state": "beta",
 
   "info": {
     "description": "Singlestat Panel for Grafana",