Remove standalone true from platform and UIF (#15032)

Remove standalone: true from every instance since it's the default as of Angular 19.

libs/components/src/navigation/nav-group.stories.ts

@@ -13,7 +13,6 @@ import { NavGroupComponent } from "./nav-group.component";
 import { NavigationModule } from "./navigation.module";
 
 @Component({
-  standalone: true,
   template: "",
 })
 class DummyContentComponent {}