update test

Author: rshen91

src/plugins/shared_ux/public/components/toolbar/buttons/icon_button_group/icon_button_group.test.tsx

@@ -23,10 +23,6 @@ describe('<IconButtonGroup />', () => {
       enzymeMount(<ServicesProvider {...services}>{element}</ServicesProvider>);
   });
 
-  afterEach(() => {
-    jest.resetAllMocks();
-  });
-
   test('is rendered', () => {
     const component = mount(
       <IconButtonGroup