Remove all Istio kustomizations
What
Remove all Istio kustomizations.
Why
Istio was moved to gitlab-helmfiles
some time ago, and those kustomizations are causing errors:
flux-system kustomization/delivery-components-istio-rbac main@sha1:63393fff False False dependency 'flux-system/flux-components-istio' is not ready
...
flux-system kustomization/flux-components-istio False False kustomization path not found: stat /tmp/kustomization-4276123766/istio: no such file or directory