fix(angular): router compatibility with Angular 12/13 (#25456)

Resolves #25448

Author: sean-perkins

angular/src/directives/navigation/ion-router-outlet.ts

@@ -89,6 +89,7 @@ export class IonRouterOutlet implements OnDestroy, OnInit {
     private config: Config,
     private navCtrl: NavController,
     @Optional() private environmentInjector: EnvironmentInjector,
+    @Optional() private componentFactoryResolver: ComponentFactoryResolver,
     commonLocation: Location,
     elementRef: ElementRef,
     router: Router,
@@ -243,6 +244,12 @@ export class IonRouterOutlet implements OnDestroy, OnInit {
 
       const injector = new OutletInjector(activatedRouteProxy, childContexts, this.location.injector);
 
+      /**
+       * The resolver is not always provided and is required in < Angular 14.
+       * Fallback to the class-level provider when the resolver is not set.
+       */
+      resolverOrInjector = resolverOrInjector || this.componentFactoryResolver;
+
       if (resolverOrInjector && isComponentFactoryResolver(resolverOrInjector)) {
         // Backwards compatibility for Angular 13 and lower
         const factory = resolverOrInjector.resolveComponentFactory(component);