Add in default values for kiali to enable the autoscaler

General MR

Add in kiali horizontal pod autoscaler settings by default to scale up to max pods of 2 under load

Summary

Using default kiali settings for now, since I haven't seen or know a reason to scale this further by default. Values we can easily change.

#      spec:
#        maxReplicas: 2
#        minReplicas: 1
#        targetCPUUtilizationPercentage: 80

Verified the HPA is installed by default:

│ kiali                   kiali                            Deployment/kiali                            3%/80%            1                 2                  1                   2m22s              │

I'm not sure how to stress test this to get the HPA to scale, but it should scale per K8s standard scaling.

closes #1346 (closed)

Relevant logs/screenshots