chore: replace deprecated gcr.io/kubebuilder/kube-rbac-proxy

[lukas-reining]

Updates to kubebuilder scaffold v4.
This is needed as we have to migrate away fromkube-rbac-proxy as seen in #724.

This PR also removes kube-rbac-proxy and switches to metricsServerOptions.FilterProvider = filters.WithAuthenticationAndAuthorization to implement RBAC.

Fixes #724

[beeme1mr]

It's a massive PR but the changes look good. Thanks for working on this.

[toddbaert]

Thanks so much @lukas-reining . I can't see anything clearly wrong, so I'm approving thought I left a question.

Also, did you also make sure that you tested a local helm install (we don't have CI for this as mentioned here)?

If you didn't, you can use the make commands to build a local helm distribution and test that all the helm templating still works. That's about the only big thing not covered by the CI. I can also do this tomorrow if you don't have time.

[toddbaert]

@lukas-reining I packaged this locally and installed it with helm as in https://openfeature.dev/docs/tutorials/open-feature-operator/quick-start, and it worked great! I didn't test it with a new container built from this branch, but that should be covered by the CI.

As far as I'm concerned you can merge this whenever. Thanks again.

[lukas-reining]

@lukas-reining I packaged this locally and installed it with helm as in https://openfeature.dev/docs/tutorials/open-feature-operator/quick-start, and it worked great! I didn't test it with a new container built from this branch, but that should be covered by the CI.

Thanks, as written, I fixed the certificate dns name for helm.

[toddbaert]

@lukas-reining I packaged this locally and installed it with helm as in https://openfeature.dev/docs/tutorials/open-feature-operator/quick-start, and it worked great! I didn't test it with a new container built from this branch, but that should be covered by the CI.

Thanks, as written, I fixed the certificate dns name for helm.

Tested again, looks good.