Show "Description" field in summary2 component when generating pdf

### Description

I would like the text we put into the description field be visible in summary and generated PDFs

```json
{
"id": "3-5-1-id",
"type": "Input",
"textResourceBindings": {
"title": "3-5-1-title",
**"description": "3-5-1-hint"**
},
}
```

Summary.json file setup for this page:
```json
{
"$schema": "https://altinncdn.no/toolkits/altinn-app-frontend/4/schemas/json/layout/layout.schema.v1.json",
"data": {
"layout": [
{
"id": "page-3-summary",
"type": "Summary2",
"target": {
"type": "page",
"id": "3-utdanning"
}
},
]
}
```

### Additional Information

_No response_

Start at the Summary2 component and the PDF-generation path, using the shown Summary.json configuration and its description binding as the example input. Done means the description text appears in both the summary and generated PDFs; the payload does not name a specific source file or test.

Written by the indexing model from the issue text.