bug(material/chip): Mdc Chip Grid empties all options when using Reactive Forms and focusing out

### Is this a regression?

- [X] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

14.2.6

### Description

Having Reactive forms attached to `mat-chip-grid` which accepts an array of object values, clears them on focus out.

### Reproduction

Steps to reproduce:
1. Create a formgroup with some formControl
2. Bind it to ` `
3. Add some new options (or the same works if the list is already populated) that are **arrays of objects**.
4. Focus out of the component

https://stackblitz.com/edit/angular-6g9jz1?file=src%2Fapp%2Fchips-input-example.ts,src%2Fapp%2Fchips-input-example.html

Upon further investigation, figured that the core problem is that on focus out, object values are transformed to strings hence why we don't see the name property. Nevertheless objects were not transformed in v 14.


_Note:_ In the Docs Chip list works as expected because it is not bound to Reactive forms

### Expected Behavior

All options remain with previously defined object values

### Actual Behavior

All options are transformed to strings thus we have empty text options

### Environment

- Angular: 15.0.4
- CDK/Material: 15.0.3
- Browser(s): Chrome 108.0.5359.124
- Operating System: macOS Ventura 13.1

リンクされた StackBlitz の再現例から始め、特に src/app/chips-input-example.ts と src/app/chips-input-example.html を確認し、mat-chip-grid がオブジェクトの配列を使って Reactive Forms にどのようにバインドされているかを調べます。フォーカスアウト時の挙動を再現し、その後もオプションがオブジェクトの値と表示テキストを保持していることを確認します。

索引モデルが issue の本文から書いたものです。