Lists the files and folders under the specified path of a folder share link. Replaces the removed endpoint GET /api2/d/{token}/dir/.

• No account token is needed; the endpoint is accessed anonymously by the link token (an Authorization header is ignored).
• Links that are password protected or restricted to specific users/emails can only be listed within a browser session that has already passed the password/user check; otherwise 403 is returned.
• Only folder share links are supported (400 for file links).
• path is relative to the shared folder.