ref(js): Remove domId mock (#32471)

static/app/utils/__mocks__/domId.tsx

@@ -1,5 +0,0 @@
-function domId(prefix: string): string {
-  return prefix + '123456';
-}
-
-export {domId};

tests/js/setup.ts

@@ -72,7 +72,6 @@ ConfigStore.loadInitialData(fixtures.Config());
 jest.mock('lodash/debounce', () => jest.fn(fn => fn));
 jest.mock('sentry/utils/recreateRoute');
 jest.mock('sentry/api');
-jest.mock('sentry/utils/domId');
 jest.mock('sentry/utils/withOrganization');
 jest.mock('scroll-to-element', () => jest.fn());
 jest.mock('react-router', () => {