refactor: remove toplevel property accesses (#29329)

PR Close #29329

packages/forms/src/directives/ng_form.ts

@@ -23,7 +23,7 @@ export const formDirectiveProvider: any = {
   useExisting: forwardRef(() => NgForm)
 };
 
-const resolvedPromise = Promise.resolve(null);
+const resolvedPromise = (() => Promise.resolve(null))();
 
 /**
  * @description

packages/forms/src/directives/ng_model.ts

@@ -43,7 +43,7 @@ export const formControlBinding: any = {
  * - this is just one extra run no matter how many `ngModel` have been changed.
  * - this is a general problem when using `exportAs` for directives!
  */
-const resolvedPromise = Promise.resolve(null);
+const resolvedPromise = (() => Promise.resolve(null))();
 
 /**
  * @description