chore: migrate to artifactapi helm virtual repo

- replace all helm repos with artifactapi/virtual/helm
- update projects with accepted repos
- set resource requests/limits for woodpecker jobs

apps/overlays/au-syd1/observability/kustomization.yaml

@@ -9,13 +9,13 @@ resources:
 
 helmCharts:
   - name: victoria-metrics-cluster
-    repo: https://victoriametrics.github.io/helm-charts/
+    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
     version: "0.33.0"
     releaseName: victoria-metrics-cluster
     namespace: observability
     valuesFile: values-vmcluster.yaml
   - name: victoria-metrics-agent
-    repo: https://victoriametrics.github.io/helm-charts/
+    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
     version: "0.30.0"
     releaseName: victoria-metrics-agent
     namespace: observability