WipeDiskAnnotation gets ignored, when custom image-url-command gets used (bare-metal)

[guettli]

WipeDiskAnnotation gets ignored, when a custom image-url-command gets used (bare-metal)

This is the code from the traditional provisioning process. It should be extracted and used for the custom image-url-command, too:

cluster-api-provider-hetzner/pkg/services/baremetal/host/host.go · syself/cluster-api-provider-hetzner

Same for DetectLinuxOnAnotherDisk().