feat(select): ionChange will only emit from user committed changes (#26066)

BREAKING CHANGE:

`ionChange` is no longer emitted when the `value` of `ion-select` is modified externally. `ionChange` is only emitted from user committed changes, such as confirming a selected option in the select's overlay.

angular/test/base/src/app/inputs/inputs.component.html

@@ -23,7 +23,7 @@
 
     <ion-item>
       <ion-label>Select</ion-label>
-      <ion-select [(ngModel)]="select">
+      <ion-select [(ngModel)]="select" id="game-console">
         <ion-select-option value="">No Game Console</ion-select-option>
         <ion-select-option value="nes">NES</ion-select-option>
         <ion-select-option value="n64" selected>Nintendo64</ion-select-option>

angular/test/base/src/app/modal-example/modal-example.component.html

@@ -31,5 +31,8 @@
         <ion-select-option [value]="1">Option 1</ion-select-option>
       </ion-select>
     </ion-item>
+
+    <ion-button id="set-to-null" (click)="setSelect(null)">Set select value to "null"></ion-button>
+    <ion-button id="set-to-undefined" (click)="setSelect(undefined)">Set select value to "undefined"></ion-button>
   </form>
 </ion-content>

angular/test/base/src/app/modal-example/modal-example.component.ts

@@ -36,6 +36,10 @@ export class ModalExampleComponent implements OnInit, ViewWillLeave, ViewDidEnte
     this.onInit++;
   }
 
+  setSelect(value: null | undefined) {
+    this.form.get('select').setValue(value);
+  }
+
   ionViewWillEnter() {
     if (this.onInit !== 1) {
       throw new Error('ngOnInit was not called');