observability: migrate VictoriaMetrics from helm charts to operator CRDs

The k8s au-syd1 VictoriaMetrics stack ran as two helm charts
(victoria-metrics-cluster + victoria-metrics-agent) and only scraped
in-cluster targets. The victoria-metrics-operator already runs in
vm-system, so move the stack onto operator-managed CRDs. This lets the
VMAgent consume VMServiceScrape/VMPodScrape (auto-converted from
Prometheus ServiceMonitors) and adds Consul service discovery so the
cluster scrapes the same puppet-prod targets as the puppet vmagent.

Changes:
- Add VMCluster `main`: vmstorage 2 replicas (down from 3, replicationFactor
  2, cephrbd-fast-delete 200Gi, 180d retention), vminsert/vmselect 2 replicas
  + HPA (2-10, 60% cpu).
- Add VMAgent `main`: keeps the kubernetes SD jobs (apiservers/nodes/cadvisor),
  selectAllByDefault for VMServiceScrape/VMPodScrape, and a Consul SD job
  against consul.service.consul (puppet Consul) replicating the puppet vmagent
  relabels (keep tag `metrics`, scheme from `metrics_scheme`, job from
  `metrics_job`). TLS verified against the reflected vault-ca-cert (no
  insecure skip-verify).
- Expose vmselect/vminsert/vmagent via Gateway API (traefik-internal Gateway +
  HTTPRoute, http->https redirect), same hostnames as before.
- Remove the two helm charts, their values files, and vendored charts.

apps/base/observability/httproute.yaml

@@ -0,0 +1,165 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: vmselect-http-redirect
+  namespace: observability
+  labels:
+    app.kubernetes.io/name: vmselect
+    app.kubernetes.io/instance: victoria-metrics
+spec:
+  hostnames:
+    - vmselect.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: vmselect
+      sectionName: http
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: vmselect
+  namespace: observability
+  labels:
+    app.kubernetes.io/name: vmselect
+    app.kubernetes.io/instance: victoria-metrics
+spec:
+  hostnames:
+    - vmselect.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: vmselect
+      sectionName: https
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: vmselect-main
+          port: 8481
+          weight: 1
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: vminsert-http-redirect
+  namespace: observability
+  labels:
+    app.kubernetes.io/name: vminsert
+    app.kubernetes.io/instance: victoria-metrics
+spec:
+  hostnames:
+    - vminsert.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: vminsert
+      sectionName: http
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: vminsert
+  namespace: observability
+  labels:
+    app.kubernetes.io/name: vminsert
+    app.kubernetes.io/instance: victoria-metrics
+spec:
+  hostnames:
+    - vminsert.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: vminsert
+      sectionName: https
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: vminsert-main
+          port: 8480
+          weight: 1
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: vmagent-http-redirect
+  namespace: observability
+  labels:
+    app.kubernetes.io/name: vmagent
+    app.kubernetes.io/instance: victoria-metrics
+spec:
+  hostnames:
+    - vmagent.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: vmagent
+      sectionName: http
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: vmagent
+  namespace: observability
+  labels:
+    app.kubernetes.io/name: vmagent
+    app.kubernetes.io/instance: victoria-metrics
+spec:
+  hostnames:
+    - vmagent.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: vmagent
+      sectionName: https
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: vmagent-main
+          port: 8429
+          weight: 1
+      matches:
+        - path:
+            type: PathPrefix
+            value: /