Tune resource utilization for Kubecost deployment

During the initial GCP Cloud Usage integration, we saw a lot of evictions happening due to the amount of memory the kubecost-cost-analyzer pod was using.

Following https://docs.kubecost.com/install-and-configure/install/getting-started#memory-and-storage we can tune the requests/limits for this deployment, so we can avoid evictions and improve the service stability.