Enable graphql_board_lists for project boards

app/controllers/projects/boards_controller.rb

@@ -10,6 +10,7 @@ class Projects::BoardsController < Projects::ApplicationController
   before_action do
     push_frontend_feature_flag(:add_issues_button)
     push_frontend_feature_flag(:swimlanes_buffered_rendering, project, default_enabled: :yaml)
+    push_frontend_feature_flag(:graphql_board_lists, project, default_enabled: false)
   end
 
   feature_category :boards