convert resources to ResourceGenerator

[LittleChimera]

resolves #4402
continuing @koba1t's work from #5228

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @LittleChimera. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

This PR has multiple commits, and the default merge method is: merge.
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[k8s-ci-robot]

PR needs rebase.

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