Add new directive for UI tests

frontend/src/app/app.module.ts

@@ -78,6 +78,7 @@ import { ShortenStringPipe } from './shared/pipes/shorten-string-pipe/shorten-st
 import { GraphsComponent } from './components/graphs/graphs.component';
 import { DifficultyAdjustmentsTable } from './components/difficulty-adjustments-table/difficulty-adjustments-table.components';
 import { BlocksList } from './components/blocks-list/blocks-list.component';
+import { DataCyDirective } from './data-cy.directive';
 
 @NgModule({
   declarations: [
@@ -137,6 +138,7 @@ import { BlocksList } from './components/blocks-list/blocks-list.component';
     GraphsComponent,
     DifficultyAdjustmentsTable,
     BlocksList,
+    DataCyDirective,
   ],
   imports: [
     BrowserModule.withServerTransition({ appId: 'serverApp' }),