Apply cancel option on datasource RunStream

[suikast42]

If a stream request does not deliver any data then the grafana queryrunner makes high amount of stream requests until thne stream bigins to deliver data.

The normal query has a defines case for this

backend.ErrDataResponse(backend.StatusBadRequest, fmt.Sprintf("No endpoint found for for service: %s with path: %s", qm.Service, qm.Path))

Is there a possibility to that with stream ?