🐛 fix(endpoints.tsx): change returned key from 'filename' to 'file_path' for consistency

🐛 fix(inputFileComponent): update the key used to set the file path to match the change in the backend
The key returned by the endpoint was changed from 'filename' to 'file_path' for consistency. The key used to set the file path in the frontend was updated to match the change in the backend.