Add confirmation dialog to delete publications.

frontend/src/app/core/rest-services/publications/publication.rest-service.ts

@@ -1,6 +1,6 @@
 import { HttpClient, HttpParams } from '@angular/common/http';
 import { Injectable, inject } from '@angular/core';
-import { lastValueFrom } from 'rxjs';
+import { last, lastValueFrom } from 'rxjs';
 import { Publication } from './model/publication';
 
 @Injectable({
@@ -35,4 +35,8 @@ export class PublicationRestService {
     const request = { text: publicationText };
     return lastValueFrom(this.httpClient.post<string>('/api/publications/preview', request));
   }
+
+  delete(publicationId: string): Promise<void> {
+    return lastValueFrom(this.httpClient.delete<void>(`/api/publications/${publicationId}`));
+  }
 }