[2.4.0] Checkmk Werk 16825 created: parent scan: Deprecate command line tool in favor of REST API endpoint

[//]: # (werk v2) # parent scan: Deprecate command line tool in favor of REST API endpoint key | value ---------- | --- date | 2024-05-02T07:43:39+00:00 version | 2.4.0b1 class | feature edition | cre component | wato level | 1 compatible | no In this werk, we replace the `cmk --scan-parents` command line tool with a more flexible parent scan REST API endpoint. As opposed to the command line option, the new endpoint will no longer create automatically-applied `parents.mk` config files but rely on the standard WATO configuration mechanism, so changes need to be activated afterwards. **Attention: Incompatibility, possible data loss in distributed monitoring setups** If you have previously used the parent scan through the command line tool, the resulting `parents.mk` config files will be migrated into your hosts configuration during the update process. However, **only parent scan configurations on the central site will be migrated**, remote site `parents.mk` configuration files will just be ignored. If this affects your setup, please re-trigger a parent scan for the affected child hosts in the GUI or REST API.