[2.3.0] Checkmk Werk 16520 created: Bi: creating rules should allow the old style host_labels or service_labels

[//]: # (werk v2) # Bi: creating rules should allow the old style host_labels or service_labels key | value ---------- | --- date | 2024-02-16T14:17:46+00:00 version | 2.3.0b1 class | fix edition | cre component | rest-api level | 1 compatible | yes Our host labels and service labels recently went through some major changes which included updating the REST-API fields to host_label_groups and service_label_groups. However, for reasons of backward compatibility, we decided to keep the legacy host_labels and service_labels as possible fields when creating a bi rule via the REST-API. This werk implements this change, but these legacy fields will be marked as deprecated and will not be available in our next major release. It is recommended to use the new format.