Support kube-router

[shane-davidson]

Adding a request here for kube-router as a supported CNI for RKE2 :)

[brandond]

Probably unlikely at the moment, given

• Seeking New Maintainers cloudnativelabs/kube-router#1715

[aauren]

FWIW we're just trying to get some new blood into the project, not saying that kube-router won't be supported in the near future. We've already gotten several people that have reached out and are hopeful that kube-router will become even better supported in the next few months as those people begin ramping up.

[github-actions]

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