Allow for a custom healthcheck field in the operator configmap

[mbaldessari]

By populating the gitops.customHealthChecks in the patterns-operator-config
it is possible to customize the healthchecks in the argocd clusterwide
hub instance.

Tested as follows:

1. Observe stock argocd healthcheck:

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

2. Patch operator configmap

   cat > custom-hc.yaml
   - 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
   - group: batch
     kind: Job
     check: |
       hs = {}
       if obj.status ~= nil and obj.status.succeeded ~= nil and obj.status.succeeded > 0 then
         hs.status = "Healthy"
       else
         hs.status = "Progressing"
       end
       return hs
   oc patch configmap patterns-operator-config \
   -n patterns-operator \
   --type merge \
   -p "$(jq -n --arg v "$(cat ~/custom-hc.yaml)" '{"data":{"gitops.customHealthChecks":$v}}')"

3. Observe the change (no pod restarts needed):

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

4. Edit the configmap and remove the Job healthcheck:

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

[openshift-ci]

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[darkdoc]

/lgtm