Grafana-UI: Alert components tweaks (#27128)

* Grafana-UI: Add Alert docs and story

* Grafana-UI: Move Alert styles to emotion

* Grafana-UI: Tweak docs

* Grafana-UI: Update test

* Grafana-UI: Add outline to custom content

* Grafana-UI: Remove class name

* Grafana-UI: Remove _Alert.scss

* Grafana-UI: Add e2e Alert selector

* Grafana-UI: Use @deprecated

* Grafana-UI: Remove circular reference

* Grafana-UI: Final tweaks

packages/grafana-e2e/src/flows/assertSuccessNotification.ts

@@ -2,6 +2,6 @@ import { e2e } from '../index';
 
 export const assertSuccessNotification = () => {
   e2e()
-    .get('.alert-success')
+    .get('[aria-label^="Alert success"]')
     .should('exist');
 };