new stv1 api management for migration testing

@CA Gary Mastin Thanks for reaching out. To create an APIM instance in stv1 Platform you need to create APIM with VNET not specifying a management public IP creates the resource in stv1.

Refer: https://techcommunity.microsoft.com/t5/azure-paas-blog/compute-platform-versions-for-azure-api-management-service/ba-p/2836971

You can use below powershell command to create APIM in STV1

$virtualNetwork = New-AzApiManagementVirtualNetwork -SubnetResourceId "/subscriptions/a8ff56dc-3bc7-4174-b1e8-3726ab15d0e2/resourceGroups/ContosoGroup/providers/Microsoft.Network/virtualNetworks/westUsVirtualNetwork/subnets/backendSubnet"

New-AzApiManagement -ResourceGroupName "ContosoGroup" -Location "West US" -Name "ContosoApi" -Organization Contoso -AdminEmail admin@contoso.com -VirtualNetwork $virtualNetwork -VpnType "External" -Sku "Premium"

Refer: https://video2.skills-academy.com/en-us/powershell/module/az.apimanagement/new-azapimanagement?view=azps-12.0.0#example-7-create-an-api-management-service-for-an-external-virtual-network-for-stv1

do let me know incase of further queries, I would be happy to assist you.