Fix client-side renderApp test

- it was breaking on the new sendTelemetry helper (http.catch specifically, leading me to think http/context isn't being populated)
- For now, I simply mocked the SendAppSearchTelemetry component to an empty state and listened for it being called

x-pack/plugins/enterprise_search/public/applications/index.test.ts

@@ -7,13 +7,19 @@
 import { coreMock } from 'src/core/public/mocks';
 import { renderApp } from '../applications';
 
+jest.mock('./shared/telemetry', () => ({
+  SendAppSearchTelemetry: jest.fn(() => null),
+}));
+import { SendAppSearchTelemetry } from './shared/telemetry';
+
 describe('renderApp', () => {
   it('mounts and unmounts UI', () => {
     const params = coreMock.createAppMountParamters();
     const core = coreMock.createStart();
 
     const unmount = renderApp(core, params, {});
     expect(params.element.querySelector('.setup-guide')).not.toBeNull();
+    expect(SendAppSearchTelemetry).toHaveBeenCalled();
     unmount();
     expect(params.element.innerHTML).toEqual('');
   });