Fix gitlab_subscriptions N+1 query

ee/app/models/ee/namespace.rb

@@ -34,6 +34,7 @@ module EE
 
       accepts_nested_attributes_for :gitlab_subscription
 
+      scope :include_gitlab_subscription, -> { includes(:gitlab_subscription) }
       scope :with_plan, -> { where.not(plan_id: nil) }
       scope :with_shared_runners_minutes_limit, -> { where("namespaces.shared_runners_minutes_limit > 0") }
       scope :with_extra_shared_runners_minutes_limit, -> { where("namespaces.extra_shared_runners_minutes_limit > 0") }

lib/api/namespaces.rb

@@ -32,6 +32,8 @@ module API
       get do
         namespaces = current_user.admin ? Namespace.all : current_user.namespaces
 
+        namespaces = namespaces.include_gitlab_subscription if Gitlab.ee?
+
         namespaces = namespaces.search(params[:search]) if params[:search].present?
 
         options = { with: Entities::Namespace, current_user: current_user }