Performance fix for fetching previous resource IDs

[caproven]

Hello,

This PR addresses a performance issue as detailed by @ephesused when finding previous IDs for RNodes - the resource metadata is redundantly parsed inside of a loop. I have seen this simple fix cut my kustomize build time in half compared to a current 4.5.7 build.

Closes #4790

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• ✅ login: caproven / name: Christian Provenzano (e7d5f66, ca71736)

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Hi @caproven. Thanks for your PR.

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[KnVerey]

/ok-to-test

[KnVerey]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: caproven, KnVerey

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