Align project files with CodeHarbor

Since both projects are developed together and by the same team, we also want to have the same code structure and utility methods available in both projects. Therefore, this commit changes many files, but without a functional change.

config/application.rb

@@ -45,6 +45,9 @@ module CodeOcean
 
     config.action_cable.mount_path = "#{ENV.fetch('RAILS_RELATIVE_URL_ROOT', '')}/cable"
 
+    # Disable concurrent ActionCable workers to ensure ACE change events keep their order
+    config.action_cable.worker_pool_size = 1
+
     config.telegraf.tags = {application: 'codeocean'}
 
     config.after_initialize do
@@ -55,13 +58,15 @@ module CodeOcean
       Runner.strategy_class.initialize_environment
     end
 
+    # Specify default options for Rails generators
+    config.generators do |g|
+      g.orm :active_record, primary_key_type: :uuid
+    end
+
     # Allow tables in addition to existing default tags
     config.action_view.sanitized_allowed_tags = ActionView::Base.sanitized_allowed_tags + %w[table thead tbody tfoot td tr]
 
     # Extract Sentry-related parameters from WebSocket connection
     config.middleware.insert_before 0, Middleware::WebSocketSentryHeaders
-
-    # Disable concurrent ActionCable workers to ensure ACE change events keep their order
-    config.action_cable.worker_pool_size = 1
   end
 end