feat: Deploy necessary Argo CD components via Argo CD Agent helm chart

[anandrkskd]

assisted-by: cursor

What does this PR do / why we need it:

This change adds an optional argo-cd dependency to the argocd-agent-agent chart (Helm alias argocd), gated by argoCD.enabled. The Argo CD Helm chart version is aligned with github.com/argoproj/argo-cd/v3 in go.mod via a small sync script and CI check.
Maintainer docs and make targets document how to refresh Chart.lock / charts/*.tgz safely.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

  cd install/helm-repo/argocd-agent-agent
  helm dependency build
  helm upgrade --install test-agent . -n argocd --create-namespace \
    --set argoCD.enabled=false
  kubectl get pods,deploy,svc -n argocd
  
  
  helm upgrade --install test-stack . -n argocd --create-namespace \
    --set argoCD.enabled=true
  kubectl get deploy,pods -n argocd

• Confirm redis, repo-server, application-controller, etc. become Running.
• Confirm argocd-server matches intended replica count from argocd.server.replicas in default values.yaml (e.g. 0 if UI/API is intentionally scaled down).

Checklist

• Documentation update is required by this PR (and has been updated) OR no documentation update is required.

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