Adds the grafana-operator (grafana.integreatly.org CRDs + controller) so
Grafana and its dashboards/datasources can be managed declaratively as
CRs in a follow-up PR. Sits in the platform project like the other
operators (vm-system, cnpg-system).
Changes:
- Add grafana-system namespace + grafana-operator helm chart v5.24.0
(watches all namespaces).
- Render CRDs inline (crds.immutable: false) so ArgoCD installs/manages
the 13 grafana.integreatly.org CRDs instead of the skipped helm crds/
subchart.
- Register apps/overlays/*/grafana-system in the platform ApplicationSet.
