Calling settings_data.user_can_access_all_other_users on every call to
this function could be expensive when using this function in loops
over every user in the organization.
After the previous commit, those calls are still somewhat expensive
for guest users.
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".
