[AVM Module Issue]: Container Apps Environment enters failed state after enabling .NET Development Stack and running subsequent deployment

### Check for previous/existing GitHub issues

- [x] I have checked for previous/existing GitHub issues

### Issue Type?

Bug

### Module Name

avm/res/app/container-app

### (Optional) Module Version

_No response_

### Description

After enabling the .NET Development Stack on a Container App via the Azure Portal, subsequent deployments using the AVM module fail, and the associated Container Apps Managed Environment transitions to a failed provisioning state.

```
"details": [
{
"code": "OperationFailed",
"message": "Update environment AKS handler failed: 'R' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0.."
}
]
```

### (Optional) Correlation Id

_No response_