[Fleet] Enable EPM failing suite (elastic#153928)

Closes elastic#150607

## Summary
Re-enable flaky test suit in
`x-pack/plugins/fleet/public/applications/integrations/sections/epm/screens/detail/index.test.tsx`.

The flaky runner doesn't work with Jest tests, so I tested it locally
several times on my local.


### Checklist
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

---------

Co-authored-by: kibanamachine <[email protected]>

x-pack/plugins/fleet/public/applications/integrations/sections/epm/screens/detail/index.test.tsx

@@ -18,6 +18,7 @@ import type {
   GetPackagePoliciesResponse,
   GetStatsResponse,
   GetSettingsResponse,
+  GetVerificationKeyIdResponse,
 } from '../../../../../../../common/types/rest_spec';
 import type {
   DetailViewPanelName,
@@ -39,8 +40,7 @@ import { ExperimentalFeaturesService } from '../../../../services';
 ExperimentalFeaturesService.init({});
 import { Detail } from '.';
 
-// FLAKY: https://github.com/elastic/kibana/issues/150607
-describe.skip('when on integration detail', () => {
+describe('when on integration detail', () => {
   const pkgkey = 'nginx-0.3.7';
   const detailPageUrlPath = pagePathGetters.integration_details_overview({ pkgkey })[1];
   let testRenderer: TestRenderer;
@@ -138,6 +138,16 @@ describe.skip('when on integration detail', () => {
       await render();
     });
 
+    it('should NOT display agent policy usage count', async () => {
+      await mockedApi.waitForApi();
+      expect(renderResult.queryByTestId('agentPolicyCount')).toBeNull();
+    });
+
+    it('should NOT display the Policies tab', async () => {
+      await mockedApi.waitForApi();
+      expect(renderResult.queryByTestId('tab-policies')).toBeNull();
+    });
+
     it('should display version text and no callout if prerelease setting disabled', async () => {
       await mockedApi.waitForApi();
       expect((renderResult.queryByTestId('versionText') as any)?.textContent).toEqual('1.0.0');
@@ -324,6 +334,7 @@ interface EpmPackageDetailsResponseProvidersMock {
   agentPolicyList: jest.MockedFunction<() => GetAgentPoliciesResponse>;
   appCheckPermissions: jest.MockedFunction<() => CheckPermissionsResponse>;
   getSettings: jest.MockedFunction<() => GetSettingsResponse>;
+  getVerificationKeyId: jest.MockedFunction<() => GetVerificationKeyIdResponse>;
 }
 
 const mockApiCalls = (
@@ -805,6 +816,8 @@ On Windows, the module was tested with Nginx installed from the Chocolatey repos
 
   const getSettingsResponse = { item: { prerelease_integrations_enabled: true } };
 
+  const getVerificationKeyIdResponse = { id: 'test-verification-key' };
+
   const mockedApiInterface: MockedApi<EpmPackageDetailsResponseProvidersMock> = {
     waitForApi() {
       return new Promise((resolve) => {
@@ -824,6 +837,7 @@ On Windows, the module was tested with Nginx installed from the Chocolatey repos
       agentPolicyList: jest.fn().mockReturnValue(agentPoliciesResponse),
       appCheckPermissions: jest.fn().mockReturnValue(appCheckPermissionsResponse),
       getSettings: jest.fn().mockReturnValue(getSettingsResponse),
+      getVerificationKeyId: jest.fn().mockReturnValue(getVerificationKeyIdResponse),
     },
   };
 
@@ -880,6 +894,9 @@ On Windows, the module was tested with Nginx installed from the Chocolatey repos
       if (path === '/api/fleet/settings') {
         return mockedApiInterface.responseProvider.getSettings();
       }
+      if (path === '/api/fleet/epm/verification_key_id') {
+        return mockedApiInterface.responseProvider.getVerificationKeyId();
+      }
 
       const err = new Error(`API [GET ${path}] is not MOCKED!`);
       // eslint-disable-next-line no-console