Generated TS Client has missing import

### What are you generating using Kiota, clients or plugins?

API Client/SDK

### In what context or format are you using Kiota?

Nuget tool

### Client library/SDK language

Csharp

### Describe the bug

I generated in my dotnet api with FastEndpoints.ClientGen.Kiota Version 7.0.1 a typescript client. It generates this file that is missing an import of an enum object:

### Expected behavior

The import should be also include the enum object:
`import { UserAppGroup, UserAppGroupObject } from '../../../../../../models/index.js';
`

### How to reproduce

```
app.UseFastEndpoints(c =>
{
c.Endpoints.ShortNames = true;
c.Serializer.Options.Converters.Add(new JsonStringEnumConverter());
})
.UseSwaggerGen();
```

### Open API description file

```
"/api/me/apps/{appId}/group/{group}": {
"patch": {
"tags": [
"Api"
],
"operationId": "SetGroupForAppEndpoint",
"parameters": [
{
"name": "appId",
"in": "path",
"required": true,
"schema": {
"type": "integer",
"format": "int32"
}
},
{
"name": "group",
"in": "path",
"required": true,
"schema": {
"allOf": [
{
"$ref": "#/components/schemas/UserAppGroup"
}
]
}
}
],
"responses": {
"200": {
"description": "Success",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/UserAppGroup"
}
}
}
},
"401": {
"description": "Unauthorized"
},
"403": {
"description": "Forbidden"
}
}
}
},
```

"UserAppGroup": {
"type": "string",
"description": "",
"x-enumNames": [
"Standard",
"Favorite",
"Archived"
],
"enum": [
"Standard",
"Favorite",
"Archived"
]
},

### Kiota Version

1.28.0+57130b1b1db3bc5c060498682f41e20c8ae089f2

### Latest Kiota version known to work for scenario above?(Not required)

_No response_

### Known Workarounds

``

### Configuration

- OS: Windows 11
- architecture: x94

### Debug output

Click to expand log
```

```

### Other information

_No response_

Reproduce the issue with the provided OpenAPI description and Kiota version, then inspect the generated TypeScript client and model imports. The fix is complete when the generated import includes both UserAppGroup and UserAppGroupObject and the client compiles without a missing-import error.

Written by the indexing model from the issue text.