chore(argo-cd): Add chart tests and usage info in README for HA (#951)

* chore: Reconfigure KinD to 1 control-plane and 3 worker nodes

This prepares chart testing of 'argo-cd' chart with redis-ha enabled. Redis-ha defines hard pod anti-affinity and requires multiple worker nodes.

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* chore(argo-cd): Add chart tests for HA

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Add HA chapter to README

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Skip HPA tests of ArgoCD

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argo-cd/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 appVersion: 2.1.3
 description: A Helm chart for ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes.
 name: argo-cd
-version: 3.25.2
+version: 3.25.3
 home: https://github.com/argoproj/argo-helm
 icon: https://argo-cd.readthedocs.io/en/stable/assets/logo.png
 keywords:
@@ -21,4 +21,4 @@ dependencies:
     condition: redis-ha.enabled
 annotations:
   artifacthub.io/changes: |
-    - "[Changed]: Reorganize some files in repo, move applications.yaml and projects.yaml into argocd-configs."
+    - "[Added]: Chart testing for HA setups"