Instead of adding group as a subgroup, we now provide option
to add direct members and direct subgroups of a group to a
user group by providing an expand button in the group pill.
Fixes#32335.
Opening settings and stream settings UI was not working for guests
if they could not access all users. This was because is_person_active
did not handle inaccessible users correctly, if they were not added in
the users data, when being called in get_group_members to render
group pills.
"role:members" group name is displayed as "Everyone except guests"
in the UI and "role:everyone" group name is displayed as
"Everyone including guests".
