GRN2-xx: Switch the relation between users and roles to make queries cleaner and faster (#1299)

* First steps

* Fixes in account creation flow

* Fixed most testcases

* more test fixes

* Fixed more test cases

* Passing tests and rubocop

* Added rake task to remove rooms

app/models/concerns/auth_values.rb

@@ -63,7 +63,7 @@ module AuthValues
       role_provider = auth['provider'] == "bn_launcher" ? auth['info']['customer'] : "greenlight"
       roles.each do |role_name|
         role = Role.find_by(provider: role_provider, name: role_name)
-        user.roles << role if !role.nil? && !user.has_role?(role_name)
+        user.role = role if !role.nil? && !user.has_role?(role_name)
       end
     end
   end