[JENKINS-67256] Integrate with Cloud Statistics plugin

[cronik]

Add integration with cloud-stats plugin.

Implement TrackedItem on KubernetesComputer and KubernetesSlave. StandardPlannedNodeBuilder now returns a TrackedPlannedNode.

Fixes JENKINS-67256

Could be an interesting addition.

Testing done

Added unit tests and deployed to live environment.

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[Vlatombe]

Looks nice, I need to play with it and check for compatibility with proprietary work.

[alfsch]

What is missing to get this released?