notify-admin-641 let platform admins export listing of all users (#370)

Co-authored-by: Kenneth Kehl <@kkehl@flexion.us>

app/dao/users_dao.py

@@ -102,6 +102,10 @@ def get_user_by_id(user_id=None):
     return User.query.filter_by().all()
 
 
+def get_users():
+    return User.query.all()
+
+
 def get_user_by_email(email):
     return User.query.filter(func.lower(User.email_address) == func.lower(email)).one()