{Resources} group create does not surface provisioningState #33832

Background

az group create / New-AzResourceGroup never report the provisioning state. ARM returns it nested:

{"id":"...","name":"...","location":"...","properties":{"provisioningState":"Succeeded"}}

but the ResourceGroup model (src/Extensions/Resources/Models/Resourcegroup.cs) declares ProvisioningState as a flat property, so deserialization drops it and the emitted object always carries an empty string. Confirmed against a live subscription while recording the group create scenario; the same applies to group show.

Fix

Map the nested properties.provisioningState in the model (nested Properties type or a converter), and extend the scenario test assertion to cover it once it deserializes.

Confirmation

• group create and New-AzResourceGroup output includes provisioningState: Succeeded.
• The group create scenario test asserts it on both surfaces.