Label Studio vulnerable to Cross-site Scripting if `<Choices>` or `<Labels>` are used in labeling config

### Summary

On all Label Studio versions prior to 1.11.0, data imported via file upload feature is not properly sanitized prior to being rendered within a [`Choices`](https://labelstud.io/tags/choices) or [`Labels`](https://labelstud.io/tags/labels) tag, resulting in an XSS vulnerability.

### Details

Need permission to use the "data import" function. This was reproduced on Label Studio 1.10.1.

### PoC

1. Create a project.


2. Upload a file containing the payload using the "Upload Files" function.



The following are the contents of the files used in the PoC

```

{

"data": {

"prompt": "labelstudio universe image",

"images": [

{

"value": "id123#0",

"style": "margin: 5px",

"html": "<img width='400' src='https://labelstud.io/_astro/images-tab.64279c16_ZaBSvC.avif' onload=alert(document.cookie)>"

}

]

}

}

```

3. Select the text-to-image generation labeling template of Ranking and scoring



4. Select a task


5. Check that the script is running


### Impact

Malicious scripts can be injected into the code, and when linked with vulnerabilities such as CSRF, it can cause even greater damage. In particular, It can become a source of further attacks, especially when linked to social engineering.