Outdated E2E Node conformance test documentation

[phuhung273]

What steps did you take and what happened?

• AWS Node conformance test https://image-builder.sigs.k8s.io/capi/providers/aws#testing-images
• Outdated links
  • https://github.com/containernetworking/cni/releases/download/v0.7.0/cni-amd64-v0.7.0.tgz
  • https://dl.k8s.io/$(< /etc/kubernetes_community_ami_version)/kubernetes-test.tar.gz
• Outdated syntax
  • Should be /etc/kubernetes-version instead of /etc/kubernetes_community_ami_version

Anything else you would like to add?

• Update documentation following https://kubernetes.io/docs/setup/best-practices/node-conformance/

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/kind documentation