REFACTOR(repo): restructure infra folder structure

- Remove argocd/, helm-values/, ingress/ subdirectories
- Move files to parent directory with standardized names
- Add namespace.yaml to all apps with Goldilocks labels
- Preserve vault/ subdirectories (falco, velero)
- Update main kustomization.yaml to reference argocd.yaml files directly
- Comment out argocd.yaml in each app's kustomization.yaml to prevent
  circular reference

Applications restructured:
- cert-manager (2 ArgoCD apps)
- external-secrets
- reloader
- vault (2 ArgoCD apps)
- velero (2 ArgoCD apps)
- falco
- cnpg
- haproxy
- metallb
- vpa
- argocd

velero/namespace.yaml

@@ -0,0 +1,6 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: velero
+  labels:
+    goldilocks.fairwinds.com/enabled: "true"