refactor(angular): unused subscription in routerlink (#24950)

angular/src/directives/navigation/router-link-delegate.ts

@@ -1,17 +1,14 @@
 import { LocationStrategy } from '@angular/common';
-import { ElementRef, OnChanges, OnDestroy, OnInit, Directive, HostListener, Input, Optional } from '@angular/core';
+import { ElementRef, OnChanges, OnInit, Directive, HostListener, Input, Optional } from '@angular/core';
 import { Router, RouterLink } from '@angular/router';
 import { AnimationBuilder, RouterDirection } from '@ionic/core';
-import { Subscription } from 'rxjs';
 
 import { NavController } from '../../providers/nav-controller';
 
 @Directive({
   selector: '[routerLink]',
 })
-export class RouterLinkDelegateDirective implements OnInit, OnChanges, OnDestroy {
-  private subscription?: Subscription;
-
+export class RouterLinkDelegateDirective implements OnInit, OnChanges {
   @Input()
   routerDirection: RouterDirection = 'forward';
 
@@ -34,12 +31,6 @@ export class RouterLinkDelegateDirective implements OnInit, OnChanges, OnDestroy
     this.updateTargetUrlAndHref();
   }
 
-  ngOnDestroy(): void {
-    if (this.subscription) {
-      this.subscription.unsubscribe();
-    }
-  }
-
   private updateTargetUrlAndHref() {
     if (this.routerLink?.urlTree) {
       const href = this.locationStrategy.prepareExternalUrl(this.router.serializeUrl(this.routerLink.urlTree));