Consider using kubebuilder tools for generating RBAC

[BlaineEXE]

Enhancement

Why is this needed?:

Kubebuilder can generate RBAC for controllers automatically using // +kubebuilder:rbac:groups comments in controller code.

Currently, default versions of these comments are present already in controller/sidecar internal/ code, but they are not set up to auto-generate any files.

Describe the solution you'd like in detail:

The COSI project should decide what to do with the existing comments.

Should COSI use them to generate RBAC files? If so, let's set this up.

If not, I believe we should remove them so that they don't grow outdated over time.

Describe alternatives you've considered:

Additional context: