[WIP] Drop v1.Node from workItem

[dims]

Trying to see what breaks if we don't have to keep references to v1.Node around in the queue and just grab it as we need it. Queue holding onto v1.Node could bump memory usage perhaps?

/kind cleanup

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/kind api-change
/kind bug
/kind cleanup
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/kind documentation
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/kind feature
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[k8s-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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