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/item/item-action.component.ts

@@ -4,7 +4,6 @@ import { A11yCellDirective } from "../a11y/a11y-cell.directive";
 
 @Component({
   selector: "bit-item-action",
-  standalone: true,
   imports: [],
   template: `<ng-content></ng-content>`,
   providers: [{ provide: A11yCellDirective, useExisting: ItemActionComponent }],

libs/components/src/item/item-content.component.ts

@@ -16,7 +16,6 @@ import { TypographyModule } from "../typography";
 
 @Component({
   selector: "bit-item-content, [bit-item-content]",
-  standalone: true,
   imports: [TypographyModule, NgClass],
   templateUrl: `item-content.component.html`,
   host: {

libs/components/src/item/item-group.component.ts

@@ -2,7 +2,6 @@ import { ChangeDetectionStrategy, Component } from "@angular/core";
 
 @Component({
   selector: "bit-item-group",
-  standalone: true,
   imports: [],
   template: `<ng-content></ng-content>`,
   changeDetection: ChangeDetectionStrategy.OnPush,

libs/components/src/item/item.component.ts

@@ -12,7 +12,6 @@ import { ItemActionComponent } from "./item-action.component";
 
 @Component({
   selector: "bit-item",
-  standalone: true,
   imports: [ItemActionComponent],
   changeDetection: ChangeDetectionStrategy.OnPush,
   templateUrl: "item.component.html",