Add support for creating AKS clusters without associating an SSH key in Az PowerShell (New-AzAksCluster), similar to the 'az aks create --no-ssh-key' option available in Azure CLI. Currently, PowerShell requires an SSH public key or forces -GenerateSshKey.
### Description of the new feature We have a customer scenario highlighting a feature parity gap between Azure CLI and Az PowerShell when creating AKS clusters, specifically around SSH key handling. Azure CLI supports creating AKS clusters without associating an SSH key using: az aks create --no-ssh-key In contrast, Az PowerShell (New-AzAksCluster) currently: Requires an SSH public key (default ~/.ssh/id_rsa.pub), or Forces -GenerateSshKey There is no PowerShell flag to explicitly opt out of SSH key creation or persistence and they are using powershell based script to create the clusters. ### Proposed implementation details (optional) _No response_