Add arm64 support of kubekins-e2e and krte images.

[ruquanzhao]

Add arm64 config in the images/kubekins-e2e/variants.yaml, and change some steps in build processes.

related to: #23044

Signed-off-by: Ruquan Zhao ruquan.zhao@arm.com

[k8s-ci-robot]

Hi @ruquanzhao. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ruquanzhao
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[k8s-ci-robot]

@ruquanzhao: PR needs rebase.

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[chendave]

@ruquanzhao this PR need rebase

[chendave]

/cc