CustomVision Kind : both

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Where would you like this feature added?

Examples (Quickstart, Samples, etc.)

### Is this feature ask due to a problem that you are encountering?

When using terraform to create CustomVision resource, only "CustomVision.Prediction" or "CustomVision.Training" is supported.

```
resource "azurerm_cognitive_account" "cognitive_service" {
name = "CognitiveService-${random_string.azurerm_cognitive_account_name.result}"
location = azurerm_resource_group.rg.location
resource_group_name = azurerm_resource_group.rg.name
sku_name = var.sku
kind = "CustomVision.Prediction"
}
```

However the Azure Portal also supports a resource type both.

How can this be supported with Terraform?

### Describe potential solutions.

Adding a new parameter in kind field to support Custom Vision resource type both.

### Anything else?

_No response_

Start by locating the Terraform resource implementation and validation for azurerm_cognitive_account's kind field, then check how CustomVision.Prediction and CustomVision.Training are represented. Done means the kind value for a combined Custom Vision resource is accepted and can be used to create the resource consistently with the Azure Portal.

Written by the indexing model from the issue text.