Default the room header to on (#12803)

* Default the room header to on

* Refactor code into helper method

Add a method to open/close the room info panel and use it everywhere.

* Fix broken tests, update snapshots and screenshots

* Update room header tests to make sense with the new header

src/settings/Settings.tsx

@@ -587,7 +587,7 @@ export const SETTINGS: { [setting: string]: ISetting } = {
         labsGroup: LabGroup.Rooms,
         displayName: _td("labs|new_room_decoration_ui"),
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG,
-        default: false,
+        default: true,
         controller: new ReloadOnChangeController(),
         betaInfo: {
             title: _td("labs|new_room_decoration_ui_beta_title"),