Normalize the hardcoded images used for warmpool pre-pulling

[rifelpet]

Fixes #16871

When AWS WarmPool is enabled, nodeup pre-pulls a hardcoded list of images based on the cluster's assets:

https://github.com/rifelpet/kops/blob/4a882890ff2addb1ae0f69f93280102969ab64d3/pkg/nodemodel/nodeupconfigbuilder.go#L490-L507

When a cluster has:

spec:
  assets:
    containerProxy: public.ecr.aws/1234

All of the assets are remapped to begin with the containerProxy value. This results in the WarmPool logic not matching against any of the cluster's assets, and nodeup doesn't treat the instance as being in the warm pool.

Now we run the hardcoded images through the same remapping logic to ensure its matched against any images used in the cluster's assets.

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[rifelpet]

/hold
for manual testing with the e2e job's KOPS_BASE_URL.

[k8s-ci-robot]

@rifelpet: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-cni-flannel	a01e7b8	link	true	/test pull-kops-e2e-cni-flannel

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