[2.4.0] Checkmk Werk 16671 created: Add "Update service labels" option to service_discovery endpoint

[//]: # (werk v2) # Add "Update service labels" option to service_discovery endpoint key | value ---------- | --- date | 2024-05-15T07:27:47+00:00 version | 2.4.0b1 class | feature edition | cre component | rest-api level | 1 compatible | yes [Werk 16466](https://checkmk.com/werk/16466) introduced the option to update discovered service labels. This feature was missing for the REST API service discovery endpoint. This can now be done by using the `only_service_labels` mode for the `/domain-types/service_discovery_run/actions/start/invoke` endpoint