[Alerting] - Display scenes using SceneAppPage for caching (#74767)

* Display scenes using SceneAppPage for caching

Also, reorganizing them in different tabs per Torkel's suggestion

* Fix lint

* Alerting home app poc

* Fix imports

* fix routing

* remove width

* Apply feature flags back

* Add comment regarding enabling the rule group query variable

* Upgrade scenes lib

* Add query variables back

---------

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

package.json

@@ -251,7 +251,7 @@
     "@grafana/lezer-traceql": "0.0.6",
     "@grafana/monaco-logql": "^0.0.7",
     "@grafana/runtime": "workspace:*",
-    "@grafana/scenes": "^1.1.1",
+    "@grafana/scenes": "^1.3.1",
     "@grafana/schema": "workspace:*",
     "@grafana/ui": "workspace:*",
     "@kusto/monaco-kusto": "^7.4.0",