Allow for extra HealthChecks for argo

[mbaldessari]

Tested with:

acm:
  extraResourceHealthChecks:
    - group: app
      kind: Deployment
      check: |
        hs = {}
        if obj.status ~= nil then
          if obj.status.readyReplicas == obj.status.replicas then
            hs.status = "Healthy"
          else
            hs.status = "Progressing"
          end
        end
        return hs

And correctly got the following on the spoke:

oc get argocd -n vp-gitops vp-gitops -o jsonpath='{.spec.resourceHealthChecks}' | jq -r '.[].kind'
Subscription
Deployment

[darkdoc]

/lgtm