kube-router: skip 1.28 tests that fail consistently

[aauren]

@hakman

Since we un-pinned the kube-router tests from 1.27 in kubernetes/test-infra#31278 kube-router now has a couple of new tests that fail consistently.

I'm still working through these, but since the project likes to avoid having consistently failing tests, I figure it would be better to exclude these ones for now.

See: https://testgrid.k8s.io/kops-network-plugins#kops-aws-cni-kuberouter

[k8s-ci-robot]

Hi @aauren. Thanks for your PR.

I'm waiting for a kubernetes 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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[hakman]

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[k8s-ci-robot]

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