[2.3.0] Checkmk Werk 16476 created: add labels for Nutanix

[//]: # (werk v2) # add labels for Nutanix key | value ---------- | --- date | 2024-03-14T10:03:01+00:00 version | 2.3.0b3 class | feature edition | cre component | checks level | 1 compatible | yes This werk adds the following labels: For the host with the Nutanix special agent: * cmk/nutanix/object:control_plane For Nutanix hosts: * cmk/nutanix/object:node * cmk/os_platform:nutanix * cmk/os_name:Nutanix AHV For Nutanix VMs: * cmk/nutanix/object:vm