@grafana/ui: Replace various icons using Icon component (#23442)

* Replace icons in dashboard and settings

* Replace icons in alerting

* Update batch of icons

* Implement icons accross various files

* Style updates

* Search: Fix recent and starred icons

* Update styling and details

* Replace new icon created by unicons

* Fix e2e test, styling

* Minor styling updates

Co-authored-by: Clarity-89 <homes89@ukr.net>

public/app/core/selectors/navModel.ts

@@ -4,7 +4,7 @@ function getNotFoundModel(): NavModel {
   const node: NavModelItem = {
     id: 'not-found',
     text: 'Page not found',
-    icon: 'fa fa-fw fa-warning',
+    icon: 'exclamation-triangle',
     subTitle: '404 Error',
     url: 'not-found',
   };