Investigate Enabling HorizontalPodAutoscaler Resource in ArgoCD chart

The ArgoCD chart comes with a HorizontalPodAutoscaler resource and we've confirmed that ArgoCD only requires an Environment Variable being present to support multiple replcas: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/master/docs/understanding-bigbang/package-architecture/argocd.md#high-availability

Test deploying ArgoCD with these HorizontalPodAutoscalers enabled via server.autoscaling.enabled & repoServer.autoscaling.enabled and see if any of the autoscaling values need to be tuned or altered for better performance.

If no issues or other dependencies are required, enable this HorizontalPodAutoscaler for the package in BigBang so it is enabled by default and ensuring that Environment Var is also conditionally present.

• Deploy and test ArgoCD with HorizontalPodAutoscaler resources
• Document any caveats or recommendations in above linked package-architecture/argocd.md#high-availability document
• Enable HPA in BigBang if no large caveats or recommendations are required