Ensure that VPN Encryption is enabled for Azure Virtual WAN

VPN Encryption is disabled for Azure Virtual WAN. This can have an impact on the confidentiality of the data.

The console UI doesn't have the same option to disable VPN encryption, however if it is disabled in Terraform, follow the steps below to remediate.

In Terraform -

1. In the azurerm_virtual_wan resource, set disable_vpn_encryption to false.

References:
https://learn.microsoft.com/en-us/azure/virtual-wan/
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/virtual_wan#disable_vpn_encryption