[2.4.0] Checkmk Werk 16475 created: downtimes: add filters for host and service groups to modify and delete endpoints

[//]: # (werk v2) # downtimes: add filters for host and service groups to modify and delete endpoints key | value ---------- | --- date | 2024-03-12T09:59:13+00:00 version | 2.4.0b1 class | feature edition | cre component | rest-api level | 1 compatible | yes This werk extends the modify and delete endpoints for downtimes with filters for hostgroups and servicegroups, similar to the create endpoints.