DashboardScene: Viewer role only support (#76748)

* Allow starring DashboardScene

* Add feature toggle to enable dashbaord scene for viewers

* Basics for proxying viewers to a dashboard scene

* Removed isHomeDashboard flag

* Don't use proxy for rendering dashboard page

* Revert "Don't use proxy for rendering dashboard page"

This reverts commit 95836bdb2c.

* Pre-fetch dashboard prior page rendering

* Depend only on dashboard permissions

* Update default home dashboard to proper model...

* Fix breadcrumbs

* Types update

* Dashboards page proxy tests

* Fix missing controls

* URLs generation

* DashboardScenePageStateManager caching test

* Tests updates

* Fix wrong import

* Test update

* Gen

public/app/features/dashboard-scene/scene/PanelMenuBehavior.test.tsx

@@ -80,6 +80,9 @@ async function buildTestScene(options: SceneOptions) {
   const scene = new DashboardScene({
     title: 'hello',
     uid: 'dash-1',
+    meta: {
+      canEdit: true,
+    },
     body: new SceneGridLayout({
       children: [
         new SceneGridItem({