HetznerBareMetalHost hangs in deprovisioning state if not fully provisioned

[janiskemper]

/kind bug

What steps did you take and what happened:

1. Start provisioning a HetznerBareMetalHost
2. Kill the HetznerBareMetalMachine that owns the HetznerBareMetalHost in the state "image-installing".
3. Wait until HetznerBareMetalHost goes to phase "deprovisioning"

If the HetznerBareMetalHost reaches the state "deprovisioning", it stays there for no apparent reason for a long time. During this step, the HetznerBareMetalHost should only call one ssh command and then go to "state none". The ssh command is called, but the state none is not reached for some reason,

Side note: the ssh command should only be called for HetznerBareMetalHosts that are fully provisioned, otherwise it does not make sense.

What did you expect to happen:

1. The HetznerBareMetalHost should not hang in that state for so long
2. The ssh command should only be called if the host is fully provisioned