plugin-e2e: Fix flaky test (#83370)

fix mock issue

e2e/plugin-e2e/plugin-e2e-api-tests/as-admin-user/panelEditPage.spec.ts

@@ -1,4 +1,4 @@
-import { expect, test } from '@grafana/plugin-e2e';
+import { DashboardPage, expect, test } from '@grafana/plugin-e2e';
 
 import { formatExpectError } from '../errors';
 import { successfulDataQuery } from '../mocks/queries';
@@ -33,8 +33,11 @@ test.describe('query editor query data', () => {
 });
 
 test.describe('query editor with mocked responses', () => {
-  test('and resource `scenarios` is mocked', async ({ panelEditPage, selectors }) => {
-    await panelEditPage.mockResourceResponse('scenarios', scenarios);
+  test('and resource `scenarios` is mocked', async ({ page, selectors, grafanaVersion, request }) => {
+    const dashboardPage = new DashboardPage({ page, selectors, grafanaVersion, request });
+    await dashboardPage.goto();
+    await dashboardPage.mockResourceResponse('scenarios', scenarios);
+    const panelEditPage = await dashboardPage.addPanel();
     await panelEditPage.datasource.set('gdev-testdata');
     const queryEditorRow = await panelEditPage.getQueryEditorRow('A');
     await queryEditorRow.getByLabel('Scenario').last().click();