Upgrade angular from 18 to 19.

frontend/src/app/components/publication-list/publication-list.component.ts

@@ -7,7 +7,6 @@ import { MatTooltipModule } from "@angular/material/tooltip";
 
 @Component({
     selector: 'app-publication-list',
-    standalone: true,
     templateUrl: './publication-list.component.html',
     styleUrl: './publication-list.component.scss',
     imports: [CommonModule, RouterModule, MatTooltipModule]