Remove delivery Istio overlays
What
Remove the Istio delivery overlays as they cause confusion, it is a single component and should be managed by a single tenant.
Why
https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24263
Remove the Istio delivery overlays as they cause confusion, it is a single component and should be managed by a single tenant.
https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24263