Currently, FacilityBot recognizes the instance and role of a user based on their sign-in email address. However, each email address can only be linked to one instance / role. An "Account Switcher" UI will be useful for those users with multiple FacilityBot accounts. If an email address is linked to multiple FacilityBot accounts, show a switcher to allow user to switch (i.e. sign in / out) between multiple accounts