Add Istio Ingress values overlays
What
- Migrate istio ingress values ConfigMaps from delivery tenant to reliability for
pre
clusters. - Migrate istio-cni values ConfigMaps from delivery tenant for
pre-gl-gke-2
cluster. - Configure Istio Ingress overlays for gstg-gitlab-gke.
Why
All istio base configurations should live within the Reliability tenant to make it easier to maintain.
Related Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24157
Edited by Marcel Chacon