[kpt deployer] Fix non-kustomize manifests not rendered issue (#5627)
[kpt deployer] Fix non-kustomize manifests not rendered issue (#5627)

root cause: version changes. kpt-sourced manfiest cannot pipeline directly into the kpt function pipeline.
Fix: The sourced manifest is of type "ResourceList" and the raw manifests are stored in the ResourceList.Items.
GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold,GoogleContainerTools/skaffold