Replace Makara with an initial Rails 6 role based splitting method.

app/controllers/auth/sessions_controller.rb

@@ -10,7 +10,6 @@ class Auth::SessionsController < Devise::SessionsController
   prepend_before_action :authenticate_with_two_factor, if: :two_factor_enabled?, only: [:create]
   before_action :set_instance_presenter, only: [:new]
   before_action :set_body_classes
-  before_action :use_master
 
   def new
     Devise.omniauth_configs.each do |provider, config|
@@ -36,10 +35,6 @@ class Auth::SessionsController < Devise::SessionsController
 
   protected
 
-  def use_master
-    User.connection.stick_to_master!
-  end
-
   def find_user
     if session[:otp_user_id]
       User.find(session[:otp_user_id])