Bug: On removing user from box, it does not end user session

[sarthakpranesh]

Release build version: v1.0.0
Issue: if a user is removed from a box and if the user has that box set in context then the app does not validate if the user is still a member of the box or not. This lets the removed user to still act as member of the box though they aren't.
Expected Behaviour: when a user is removed from a box make sure all user sessions on that box are expired and the user is shifted to another box or is asked to create one. Optionally a toast can be shown to suggest the same that the user was removed.