perf: eliminate unnecessary RNode creation

[ephesused]

Eliminate an unnecessary RNode creation in RNode.getMetaData.

This PR addresses a deferred review comment from @KnVerey under #4944.

[k8s-ci-robot]

Hi @ephesused. Thanks for your PR.

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[natasha41575]

/ok-to-test

[natasha41575]

/lgtm

[natasha41575]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ephesused, natasha41575

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