list_users throws Exception "too many values to unpack"

[theocnrds]

Describe the bug
GET Endpoint users (func list_users()) expects two values (next_cursor and users) from� server.user_manager.list_users(cursor=cursor, limit=limit) which returns only a single list of User instances.

[sarahwooders]

We don't recommend using the user objects provided by letta - if you have your own notion of a user in your application, you should use the tags field in agents to tag agents with your end user IDs.