Labels: textDirection does nothing

### Expected behavior

From what I understand from the documentation, it should force right to left or left to right text direction for the legend.

```
/**
* This will force the text direction 'rtl' or 'ltr' on the canvas for rendering the legend, regardless of the css specified on the canvas
* @default canvas's default
*/
textDirection: string;
```

### Current behavior

Nothing happens when textDirection is set. Or maybe I'm not looking for the right result... In that case I wish there was a demo of what this property does on the demo site of Chart.js.

The boolean `rtl` property is working well though.

### Reproducible sample

https://codepen.io/teodorachiosa/pen/RwmZmWR

### Optional extra steps/info to reproduce

_No response_

### Possible solution

_No response_

### Context

_No response_

### chart.js version

4.4.2

### Browser name and version

Chrome 125.0.6422.147

### Link to your project

_No response_