Add a Kubeflow chart

[m-bull]

This is a series of tasks:

• Make a kustomization referring to the kubeflow manifests at the latest tag, which produces the required manifests and commit to this repo.
• Generate a Helm Chart using the above kustomization. Use this for inspiration and turn it into a script that lives in this repo. Run the script and commit the script and output to this repo. The CI will handle adding the Helm chart to the repository.
• Make an azimuth-ops branch that has this chart as an app template, then deploy through Azimuth and access via port-forward and the example user.
• Add Zenith reservation and client CRDs to proxy the istio ingress gateway with no authentication (kubeflow's default auth applies, but it gets a Zenith domain).
• Make a kustomization to enable Dex to understand the X-Remote-User header sent by Zenith and regenerate charts.