refactor(forms): modernize value accessor integration tests

Migrate the value accessor integration spec to current Angular patterns:
- use standalone fixtures that import only the forms module they need,
  instead of declaring them through an `initTest` helper
- replace `*ngFor`/`*ngIf` with `@for`/`@if`
- use `inject()` instead of constructor injection

The reactive and template integration specs reuse two of these fixtures and
are updated to create them directly.

Author: MeAkib

packages/forms/test/reactive_integration_spec.ts

@@ -66,7 +66,7 @@ import {
   ValueChangeEvent,
 } from '../src/model/abstract_model';
 
-import {MyInput, MyInputForm} from './value_accessor_integration_spec';
+import {MyInputForm} from './value_accessor_integration_spec';
 
 // Produces a new @Directive (with a given selector) that represents a validator class.
 function createValidatorClass(selector: string) {
@@ -820,7 +820,7 @@ describe('reactive forms integration tests', () => {
       });
 
       it('should not add disabled attribute to custom controls when disable() is called', async () => {
-        const fixture = initTest(MyInputForm, MyInput);
+        const fixture = TestBed.createComponent(MyInputForm);
         const control = new FormControl('some value');
         fixture.componentInstance.form = new FormGroup({login: control});
         await fixture.whenStable();

packages/forms/test/template_integration_spec.ts

@@ -41,7 +41,7 @@ import {
   Validator,
 } from '../index';
 
-import {NgModelCustomComp, NgModelCustomWrapper} from './value_accessor_integration_spec';
+import {NgModelCustomWrapper} from './value_accessor_integration_spec';
 
 describe('template-driven forms integration tests', () => {
   useAutoTick();
@@ -1383,7 +1383,7 @@ describe('template-driven forms integration tests', () => {
     });
 
     it('should disable a custom control if disabled attr is added', async () => {
-      const fixture = initTest(NgModelCustomWrapper, NgModelCustomComp);
+      const fixture = TestBed.createComponent(NgModelCustomWrapper);
       fixture.componentInstance.name = 'Nancy';
       fixture.componentInstance.isDisabled = true;
       await fixture.whenStable();