refactor: add host name & namespace as annotations

[FabianKramm]

What issue type does this pull request address? (keep at least one, remove the others)
/kind enhancement

Please provide a short message that should be published in the vcluster release notes

• Adds vcluster.loft.sh/object-host-name and vcluster.loft.sh/object-host-namespace annotations to find out if a host object was copied. This is necessary for integrations where the controller in the host cluster can copy objects (e.g. KubeVirt's VirtualMachineClone), so we can identify based on these new annotations if the host object name actually matches the annotation.
• Fixes an issue with vCluster service selector sync where translation was not correct
• Moves try to translate back into the mapper
• Only translate "release" label in single-namespace-mode

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