OZG-7726 remove unused field

alfa-client/apps/alfa-e2e/src/helper/vorgang/vorgang.helper.ts

-import { E2EVorgangNavigator } from './vorgang.navigator';
 import { E2EVorgangVerifier } from './vorgang.verifier';
 
 export class E2EVorgangHelper {
   private readonly verifier: E2EVorgangVerifier = new E2EVorgangVerifier();
-  private readonly navigator: E2EVorgangNavigator = new E2EVorgangNavigator();
 
   public hasForwardingButton(): void {
     this.verifier.verifyForwardingButtonExists();