Inconsistent error handling

I'm noticing that certain resource requests have different error handling. For instance, returning a 422 for a volume action will raise a `FailedCreate` error, but a 429 response doesn't raise an error at all but returns a json string containing the body of the response. The [code for this resource](https://github.com/digitalocean/droplet_kit/blob/main/lib/droplet_kit/resources/volume_action_resource.rb) is pretty straightforward. Is there a reason for this approach?