add ftr tests for panel group order in dashboards (elastic#192168)

## Summary

follow up to elastic#191828, this FTR
test makes it such that any modification to registered add panel actions
group order would require an approval from the presentation team.

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### Risk Matrix

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Before closing this PR, invite QA, stakeholders, and other developers to
identify risks that should be tested prior to the change/feature
release.

When forming the risk matrix, consider some of the following examples
and how they may potentially impact the change:

| Risk | Probability | Severity | Mitigation/Notes |

|---------------------------|-------------|----------|-------------------------|
| Multiple Spaces&mdash;unexpected behavior in non-default Kibana Space.
| Low | High | Integration tests will verify that all features are still
supported in non-default Kibana Space and when user switches between
spaces. |
| Multiple nodes&mdash;Elasticsearch polling might have race conditions
when multiple Kibana nodes are polling for the same tasks. | High | Low
| Tasks are idempotent, so executing them multiple times will not result
in logical error, but will degrade performance. To test for this case we
add plenty of unit tests around this logic and document manual testing
procedure. |
| Code should gracefully handle cases when feature X or plugin Y are
disabled. | Medium | High | Unit tests will verify that any feature flag
or plugin combination still results in our service operational. |
| [See more potential risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx) |


### For maintainers

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test/functional/apps/dashboard/group5/dashboard_panel_listing.ts

@@ -0,0 +1,71 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+import expect from '@kbn/expect';
+
+import { FtrProviderContext } from '../../../ftr_provider_context';
+
+export default function ({ getService, getPageObjects }: FtrProviderContext) {
+  const PageObjects = getPageObjects(['dashboard', 'header', 'visualize', 'settings', 'common']);
+  const testSubjects = getService('testSubjects');
+  const kibanaServer = getService('kibanaServer');
+  const dashboardAddPanel = getService('dashboardAddPanel');
+
+  describe('dashboard panel listing', () => {
+    before(async () => {
+      await kibanaServer.savedObjects.cleanStandardList();
+      await kibanaServer.importExport.load(
+        'test/functional/fixtures/kbn_archiver/dashboard/current/kibana'
+      );
+      await kibanaServer.uiSettings.replace({
+        defaultIndex: '0bf35f60-3dc9-11e8-8660-4d65aa086b3c',
+      });
+    });
+
+    after(async () => {
+      await kibanaServer.savedObjects.cleanStandardList();
+    });
+
+    it('renders a panel with predefined order of panel groups', async () => {
+      await PageObjects.dashboard.navigateToApp();
+      await PageObjects.dashboard.clickNewDashboard();
+      await PageObjects.dashboard.switchToEditMode();
+
+      await dashboardAddPanel.clickEditorMenuButton();
+
+      const panelSelectionList = await testSubjects.find('dashboardPanelSelectionList');
+
+      const panelGroupByOrder = new Map();
+
+      const panelGroups = await panelSelectionList.findAllByCssSelector(
+        '[data-test-subj*="dashboardEditorMenu-"]'
+      );
+
+      for (let i = 0; i < panelGroups.length; i++) {
+        const panelGroup = panelGroups[i];
+        const order = await panelGroup.getAttribute('data-group-sort-order');
+        // @ts-ignore
+        const [, panelGroupTitle] = (await panelGroup.getAttribute('data-test-subj'))?.match(
+          /dashboardEditorMenu-(.*)/
+        );
+
+        panelGroupByOrder.set(order, panelGroupTitle);
+      }
+
+      expect(panelGroupByOrder.size).to.eql(4);
+
+      expect([...panelGroupByOrder.values()]).to.eql([
+        'visualizationsGroup',
+        'annotation-and-navigationGroup',
+        'observabilityGroup',
+        'legacyGroup',
+      ]);
+    });
+  });
+}

test/functional/apps/dashboard/group5/index.ts

@@ -37,6 +37,7 @@ export default function ({ getService, loadTestFile }: FtrProviderContext) {
     loadTestFile(require.resolve('./dashboard_error_handling'));
     loadTestFile(require.resolve('./legacy_urls'));
     loadTestFile(require.resolve('./saved_search_embeddable'));
+    loadTestFile(require.resolve('./dashboard_panel_listing'));
 
     // Note: This one must be last because it unloads some data for one of its tests!
     // No, this isn't ideal, but loading/unloading takes so much time and these are all bunched