[BUG] [Automation] Operation Usages_ListByAutomationAccount always returns InternalServerError

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/automation/resource-manager/Microsoft.Automation/stable/2023-11-01/account.json#L382

### API Spec version

2023-11-01

### Describe the bug

Calling the API below always gets InternalServerError with status 500.
```
/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Automation/automationAccounts/{automationAccountName}/usages
```

### Expected behavior

API should be able to return the usage for automation account.

### Actual behavior

API returns InternalServerError.
{
"code": "InternalServerError",
"message": "{\"Message\":\"An error has occurred.\"}"
}

### Reproduction Steps

Try calling the API https://learn.microsoft.com/en-us/rest/api/automation/usages/list-by-automation-account?view=rest-automation-2023-11-01&tabs=HTTP#code-try-0.

### Environment

_No response_

Start with specification/automation/resource-manager/Microsoft.Automation/stable/2023-11-01/account.json at the Usages_ListByAutomationAccount operation referenced in the issue, then reproduce the request using the linked REST documentation. Done means the endpoint returns the automation account usage response instead of HTTP 500 InternalServerError.

Written by the indexing model from the issue text.