Remove `status` field from response payload of deployments

[flippingbits]

We started with enriching the response payload of deployment endpoints with the status information of the underlying Kubernetes Deployment.

In the meantime, we added /health endpoints which make these information more or less obsolete.

As a consequence, we should

• stop adding the status field to deployment response payloads.
• create a separate endpoint that provides the underlying Kubernetes Deployment. This might be helpful to, for instance, investigate how many replicas of the Kubernetes Deployment are available.