Allow the usage of Ephemeral OS Disk with multiple VM SKUs

**Is your feature request related to a problem? Please describe.**
I would like to use VM SKUs as AKS nodepools that support Ephemeral Disk but the cache size is not larger than 130GiB.
One example would be the VM SKU Standard_DS2_v2 that has 86 GiB and documented here : https://learn.microsoft.com/en-us/azure/aks/cluster-configuration#ephemeral-os

**Describe the solution you'd like**
The ability to use a broader less expensive VM SKU variety that have over 30 GiB of cache storage.

Start by reviewing the AKS ephemeral OS disk documentation linked in the issue and locating the repository's AKS node pool configuration entry points. Determine how VM SKU cache-size requirements are currently represented, then verify that supported SKUs above the requested threshold can be configured without breaking existing deployments.

Written by the indexing model from the issue text.