Run app TCB evaluation

curl --request GET \
  --url https://cloud-api.phala.com/api/v1/apps/{app_id}/attestations/tcb-evaluation

{
  "app_id": "<string>",
  "instances": [
    {
      "vm_uuid": "<string>",
      "name": "<string>",
      "instance_id": "<string>",
      "status": "<string>",
      "image_version": "<string>",
      "ppid": "",
      "device_id": "<string>",
      "evaluation_update": "early",
      "evaluation_ok": true,
      "evaluation_status": "<string>",
      "error": "<string>"
    }
  ],
  "update": "early"
}