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/async-actions/form-button.directive.ts

@@ -25,7 +25,6 @@ import { BitSubmitDirective } from "./bit-submit.directive";
  */
 @Directive({
   selector: "button[bitFormButton]",
-  standalone: true,
 })
 export class BitFormButtonDirective implements OnDestroy {
   private destroy$ = new Subject<void>();