bug: ion-label does not render when binding innerHTML directly

### Prerequisites

- [x] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#creating-an-issue).
- [x] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [x] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already report this problem, without success.

### Ionic Framework Version

v9.x, v8.x

### Current Behavior

When binding innerHTML directly to ion-label it does not get rendered.

### Expected Behavior

When binding innerHTML directly to ion-label it should be rendered.

### Steps to Reproduce

### Code Reproduction URL

https://stackblitz.com/edit/mchyfkqo?file=src%2Fapp%2Fexample.component.ts,src%2Fapp%2Fexample.component.html

### Ionic Info

However, wrapping the same content inside a native element works correctly:

### Additional Information

_No response_

Start by running the StackBlitz reproduction and inspect src/app/example.component.ts and src/app/example.component.html, comparing direct [innerHTML] binding on ion-label with the nested span case. Done means the bound HTML renders when applied directly to ion-label without breaking the working wrapped example.

由索引模型根据 Issue 内容生成。