ES6 imports breaking client in Expo

### 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

TypeScript

### Describe the bug

Relative Imports now include a "index.js" suffix which seems to be causing issues when bundling in React native/expo.

Possible related issue #4950

```ts
Imports are currently generated as
// @ts-ignore
import { DocumentsRequestBuilderNavigationMetadata, type DocumentsRequestBuilder } from './documents/index.js';
// @ts-ignore
import { ProfilesRequestBuilderNavigationMetadata, ProfilesRequestBuilderRequestsMetadata, type ProfilesRequestBuilder } from './profiles/index.js';
// @ts-ignore
import { ThreadsRequestBuilderNavigationMetadata, type ThreadsRequestBuilder } from './threads/index.js';
```

Example error message by Expo
```
Android Bundling failed 63ms C:\Users\[REDACTED]\node_modules\expo-router\entry.js (1 module)
Unable to resolve "../../../models/index.js" from "lib\api\v1\auth\register\index.ts"
```

### Expected behavior

Imports should be generated as

```ts
// @ts-ignore
import { DocumentsRequestBuilderNavigationMetadata, type DocumentsRequestBuilder } from './documents';
// @ts-ignore
import { ProfilesRequestBuilderNavigationMetadata, ProfilesRequestBuilderRequestsMetadata, type ProfilesRequestBuilder } from './profiles';
// @ts-ignore
import { ThreadsRequestBuilderNavigationMetadata, type ThreadsRequestBuilder } from './threads';
```

Or provide an additional flag to override the default behaviour.

### How to reproduce

Generate any typescript client with `kiota generate`

### Open API description file

_No response_

### Kiota Version

1.18.0+5c6b5d0ef23865ba2f9d9f0b9fe4b944cf26b1ec

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

1.15

### Known Workarounds

- Search and replace to remove "/index.js".
- Downgrade to version 1.15

### Configuration

_No response_

### Debug output

Click to expand log
```

```

### Other information

This is most likely due to #4815

Reproduce the problem by generating a TypeScript client with `kiota generate`, then inspect the generated relative imports and compare bundling behavior in React Native/Expo. Done means the generated client bundles without the `/index.js` resolution error, either by omitting that suffix or by supporting the requested override flag.

Written by the indexing model from the issue text.