[Helm] Migrate to OCI Artifact for Helm charts

[nlamirault]

• for Grafana labs charts: Add OCI repository publish to ghcr.io for helm charts released from other repositories grafana/helm-charts#3068
• Mimir: Provide charts through OCI registry grafana/mimir#7628
• Cert-Manager: Add design for pushing charts to OCI registry cert-manager/cert-manager#7132
• Dex: Publish helm chart also as an OCI package (e.g. on GHCR registry) dexidp/helm-charts#128
• Ingress Nginx: Publish helm chart also as an OCI package (e.g. on GHCR registry) kubernetes/ingress-nginx#11642
• Keda: Publish Helm chart to an OCI-compatible repo to support versioning kedacore/charts#20
• Keptn: Publish Helm chart to an OCI-compatible repo keptn/lifecycle-toolkit#3605
• Cilium: CFP: upload Helm charts to OCI registry and sign them with cosign cilium/cilium#22157
• Descheduler: Publish helm chart also as an OCI package (e.g. on GHCR registry) kubernetes-sigs/descheduler#1470
• Kured: Publish helm chart also as an OCI package (e.g. on GHCR registry) kubereboot/charts#88
• Metrics Server: Publish helm chart also as an OCI package (e.g. on GHCR registry) kubernetes-sigs/metrics-server#1527
• NFS Provisioner: Publish helm chart also as an OCI package (e.g. on GHCR registry) kubernetes-sigs/nfs-subdir-external-provisioner#345
• Node Problem Detector: Publish helm chart also as an OCI package (e.g. on GHCR registry) deliveryhero/helm-charts#591
• Litmus: Publish helm chart also as an OCI package (e.g. on GHCR registry) litmuschaos/litmus-helm#391

[stale]

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