`Microsoft.ContainerService` - `kubeProxyConfig` isn't returned when preview feature is enabled

Service: `Container Service`
API Version: `2022-09-02-preview`

We'd like to add support for this feature in Terraform, unfortunately we've run into some issues regarding the behaviour of the API.

As documented in the [AKS Cluster Schema](https://learn.microsoft.com/en-us/azure/templates/microsoft.containerservice/managedclusters?pivots=deployment-language-bicep#containerservicenetworkprofilekubeproxyconfig) Kube Proxy is enabled by default on clusters. When the preview feature is enabled I would expect the API to return `kubeProxyConfig` in the response if it's enabled, i.e.
```
"networkProfile": {
...
"kubeProxyConfig": {
"enabled": true,
"mode": "IPTABLES"
}
...
}

```

Currently nothing is returned which doesn't accurately reflect the state of the cluster and also means Terraform can't know that Kube Proxy is enabled.

In addition, disabling Kube Proxy by sending
```
"kubeProxyConfig": {
"enabled": false
}
```

results in the following response from the API.
```
"kubeProxyConfig": {}
```
Which isn't inconsistent with the behaviour of features in the rest of the API, like with AGIC for example.

Would you be able to look into:
1. Adding Kube Proxy to the API response when the preview feature and is enabled and Kube Proxy is enabled.
2. Return `"enabled": false` instead of an empty dictionary when Kube Proxy is disabled.

Thanks!

Start by reviewing the Microsoft.ContainerService API definition for version 2022-09-02-preview and reproducing responses with kubeProxyConfig enabled and disabled. Done means the API response accurately represents both states, including an explicit enabled value when disabled.

Written by the indexing model from the issue text.