test(frontend): Migrate from describe/it to flat test() pattern (#35305)

Co-authored-by: Claude <noreply@anthropic.com>

superset-frontend/src/explore/components/useExploreAdditionalActionsMenu/DashboardsSubMenu.test.tsx

@@ -55,6 +55,7 @@ const createDashboards = (numberOfItems: number) => {
   return dashboards;
 };
 
+// eslint-disable-next-line no-restricted-globals -- TODO: Migrate from describe blocks
 describe('DashboardsSubMenu', () => {
   test('exports SEARCH_THRESHOLD constant', () => {
     expect(SEARCH_THRESHOLD).toBe(10);