I added the language icons to the snippet scope selector so that it
matches the language selector.

The file names are displayed for each scope where there is a existing
snippets file since it wasn't clear if a scope had a file already or
not.

| Before | After |
| - | - |
|
![before](https://github.com/user-attachments/assets/89f62889-d4a9-4681-999a-00c00f7bec3b)|
![after](https://github.com/user-attachments/assets/2d64f04c-ef8f-40f5-aedd-eca239c960e9)
|


Release Notes:

- Added language icons and file names to snippet scope selector

---------

Co-authored-by: Kirill Bulatov <kirill@zed.dev>