Support default k8s quotas properly

[jelkosz]

The current ClusterTemplateQuota defines the quota on either price/budget or on "num of cluster template instances" level. It can not define it on a level of "the user can use this amount of memory or CPU". This would not be particularly useful for clusters running in cloud, but very useful for the situation when the control plane is hypershift and the workers are kubevirt VMs running on the same cluster.
The ask here is NOT to re-implement the standard k8s quotas. The ask here is to:
1: make sure that when the standard k8s quotas are used, there is nothing standing in your way to use them to solve this use case
2: if the quota is violated, the appropriate errors are reported so that both the admin and the cluster creator can easily troubleshoot the problem