Remove support for creating non-RBAC kubernetes clusters

Problem to solve

Currently, users are offered the option to create a non-RBAC k8s cluster. This is counter to current k8s best practices and gives room for error when used in conjunction with other services (ie knative)

Target audience

Operators, developers

Further details

Proposal

On cluster creation, remove the RBAC-enabled cluster option, so that all clusters are created with RBAC enabled by default. If user wishes to remove rbac they can still do so from the command line.

What does success look like, and how can we measure that?

Links / references

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