e2e tests: Add selector to close dashboard settings and use it in e2e tests (#65625)

* add selector to close dashboard settings and use it in e2e tests

* check visibility of add panel button

* check visibility of add new panel button before clicking

e2e/cloud-plugins-suite/azure-monitor.spec.ts

@@ -2,6 +2,7 @@ import { load } from 'js-yaml';
 import { v4 as uuidv4 } from 'uuid';
 
 import { e2e } from '@grafana/e2e';
+import { GrafanaBootConfig } from '@grafana/runtime';
 
 import { selectors } from '../../public/app/plugins/datasource/azuremonitor/e2e/selectors';
 import {
@@ -96,7 +97,15 @@ const addAzureMonitorVariable = (
       break;
   }
   e2e.pages.Dashboard.Settings.Variables.Edit.General.submitButton().click();
-  e2e.components.PageToolbar.item('Go Back').click();
+  e2e()
+    .window()
+    .then((win: Cypress.AUTWindow & { grafanaBootData: GrafanaBootConfig['bootData'] }) => {
+      if (win.grafanaBootData.settings.featureToggles.topnav) {
+        e2e.pages.Dashboard.Settings.Actions.close().click();
+      } else {
+        e2e.components.PageToolbar.item('Go Back').click();
+      }
+    });
 };
 
 e2e.scenario({