DashboardScenes: Optimise e2e test and add panels suite (#88170)

* refactor tests after adding additional data-testids

* add panels-suite e2e tests

* wip: add missing selectors

* finalise panels-suite tests

* clean up

* adjust workflow for test run

* restore workflow

package.json

@@ -258,7 +258,7 @@
     "@grafana/prometheus": "workspace:*",
     "@grafana/runtime": "workspace:*",
     "@grafana/saga-icons": "workspace:*",
-    "@grafana/scenes": "^4.21.0",
+    "@grafana/scenes": "^4.23.1",
     "@grafana/schema": "workspace:*",
     "@grafana/sql": "workspace:*",
     "@grafana/ui": "workspace:*",