Argo CD values: Implement for helm

[schnatterer]

Also adds test for operator values.
Operator implementation was already done in 1b69e1e.

Can be tested with this config file

application:
  yes: true
  baseUrl: http://localhost
features:
  argocd:
    active: true
    values:
      argo-cd: 
        server:
          ingress:
            ingressClassName: "k8s-ecosystem-ces-service"

Expected result:

http://scmm.localhost/scm/repo/argocd/cluster-resources/code/sources/main/apps/argocd/argocd/values.yaml/

---
argo-cd:
  server:
    ingress:
      enabled: true
      hostname: "argocd.localhost"
      ingressClassName: "k8s-ecosystem-ces-service"
# ...