CDB3-3301 Change error message for creating announcement

Change error message in case if creating announcement needs illustration document for asset
"documents": "document with documentType=illustration is required"

error should be in next format

{
    "message": {
        "relatedEntities": {
            "0": {
                "type": "asset",
                "_id": "<asset_id>",
                "errors": {
                    "status": "422",
                    "message": {
                        "documents": [
                            "document with documentType=illustration is required"
                        ]
                    }
                }
            }
        }
    }
}