[ResponseOps][Cases] Fixed sync alerts switch flaky tests (#200738)

Fixes #192997

## Summary

I removed `createAppMockRenderer` because `SyncAlertsSwitch` is a really
simple component.

(cherry picked from commit d94f800)

x-pack/plugins/cases/public/components/case_settings/sync_alerts_switch.test.tsx

@@ -6,29 +6,20 @@
  */
 
 import React from 'react';
-import { screen } from '@testing-library/react';
+import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
-import type { AppMockRenderer } from '../../common/mock';
-import { createAppMockRenderer } from '../../common/mock';
 
 import { SyncAlertsSwitch } from './sync_alerts_switch';
 
-// Failing: See https://github.com/elastic/kibana/issues/192997
-describe.skip('SyncAlertsSwitch', () => {
-  let appMockRender: AppMockRenderer;
-
-  beforeEach(() => {
-    appMockRender = createAppMockRenderer();
-  });
-
+describe('SyncAlertsSwitch', () => {
   it('it renders', async () => {
-    appMockRender.render(<SyncAlertsSwitch disabled={false} />);
+    render(<SyncAlertsSwitch disabled={false} />);
 
     expect(await screen.findByTestId('sync-alerts-switch')).toBeInTheDocument();
   });
 
   it('it toggles the switch', async () => {
-    appMockRender.render(<SyncAlertsSwitch disabled={false} />);
+    render(<SyncAlertsSwitch disabled={false} />);
 
     await userEvent.click(await screen.findByTestId('sync-alerts-switch'));
 
@@ -39,20 +30,20 @@ describe.skip('SyncAlertsSwitch', () => {
   });
 
   it('it disables the switch', async () => {
-    appMockRender.render(<SyncAlertsSwitch disabled={true} />);
+    render(<SyncAlertsSwitch disabled={true} />);
 
     expect(await screen.findByTestId('sync-alerts-switch')).toHaveProperty('disabled', true);
   });
 
   it('it start as off', async () => {
-    appMockRender.render(<SyncAlertsSwitch disabled={false} isSynced={false} showLabel={true} />);
+    render(<SyncAlertsSwitch disabled={false} isSynced={false} showLabel={true} />);
 
     expect(await screen.findByText('Off')).toBeInTheDocument();
     expect(screen.queryByText('On')).not.toBeInTheDocument();
   });
 
   it('it shows the correct labels', async () => {
-    appMockRender.render(<SyncAlertsSwitch disabled={false} showLabel={true} />);
+    render(<SyncAlertsSwitch disabled={false} showLabel={true} />);
 
     expect(await screen.findByText('On')).toBeInTheDocument();
     expect(screen.queryByText('Off')).not.toBeInTheDocument();