Dashboards: Enable scenes by default (#93818)

* Mark Scenes feature toggles as GA

* Move old arch e2e to a new folder

* Run E2E on scenes by default

* Upgrade e2e-selectors to ensure the tests in Playwright works

e2e/old-arch/utils/flows/assertSuccessNotification.ts

@@ -0,0 +1,9 @@
+import { e2e } from '../index';
+
+export const assertSuccessNotification = () => {
+  if (e2e.components.Alert.alertV2) {
+    e2e.components.Alert.alertV2('success').should('exist');
+  } else {
+    e2e.components.Alert.alert('success').should('exist');
+  }
+};