Update the HPA to scale based on Memory Utilization too

[venmad]

Currently when we enable the autoscale to true, the existing templates are configured to use only CPU utilization metric. Could you please add memory resource utilization too in HPA manifests.
Many of the times, sentry-web and worker pods are going for OOM, as there is no scale up enabled for memory utilization.

https://kubernetes.io/docs/concepts/workloads/autoscaling/horizontal-pod-autoscale/#container-resource-metrics