Disable "additionalProperties" validation for custom components

### Description of the bug

Custom components support adding custom/additional properties, which is beneficial. However, the "additionalProperties" validation triggers error logging and prevents the components from displaying in the GUI.

### Steps To Reproduce

```json
{
"id": "metadata-version",
"type": "Custom",
"tagName": "custom-field-data",
"hereIsAnAdditionalProperty": "value for the additional property",
"dataModelBindings": {
"simpleBinding": "metadata.version"
},
"textResourceBindings": {
"title": "resource.metadata.version.title"
}
}
```

### Additional Information

_No response_

Start by reproducing the supplied custom-component JSON and tracing the additionalProperties validation that logs the error and prevents the component from displaying in the GUI. Done means custom components accept extra properties and render without that validation error.

Written by the indexing model from the issue text.