Uncaught TypeError: $(...).find(...).once is not a function

Problem/Motivation

Drupal has removed the jQuery dependency from the once feature (https://www.drupal.org/node/3158256).

Even though Radix v4 mention it works with Drupal ^10.0, `text.js` has not been updated to use the new once API.

This cause the following error when opening a formatted text field:

```
Uncaught TypeError: $(...).find(...).once is not a function
```

Steps to reproduce

• Install Drupal 10.5.2 with Radix 4.15.0
• Open a formatted text editor in the layout builder
• Open the inspector console

Proposed resolution

Update `text.js` to use the new once API as documented by Drupal.