Summary2 component does not support summaryTitle property

### Description of the bug

`summaryTitle` does not override the title of the component when `Summary2` is used to summarise said component. As the definition of `summaryTitle` states "_Title used in the summary view (overrides the default title)_", the expected behaviour is that the title should change if the `summaryTitle` is set.

### Steps To Reproduce

1. Add a component compatible with `Summary2`, such as Input or Dropdown to the form.
2. Add a `summaryTitle` to the component e.g.:
```json
"textResourceBindings": {
"title": "Component title",
"summaryTitle": "Component summaryTitle"
}
```
3. Add a `Summary2` component that refers to the component added in step 1.
4. See that the title remains unchanged from the `"title"` property.

### Additional Information

_No response_

Reproduce the issue with an Input or Dropdown component and a Summary2 component using the shown textResourceBindings. Trace how Summary2 selects the referenced component's title; done means summaryTitle is displayed when it is set, while the default title remains the fallback.

Written by the indexing model from the issue text.