Use project_authorizations instead of members to calculate manageable CI...

Use project_authorizations instead of members to calculate manageable CI projects to speed up query (#41981)

app/models/user.rb

@@ -997,7 +997,7 @@ class User < ActiveRecord::Base
   def ci_authorized_runners
     @ci_authorized_runners ||= begin
       runner_ids = Ci::RunnerProject
-        .where("ci_runner_projects.project_id IN (#{ci_projects_union.to_sql})") # rubocop:disable GitlabSecurity/SqlInjection
+        .where(project: authorized_projects(Gitlab::Access::MASTER))
         .select(:runner_id)
       Ci::Runner.specific.where(id: runner_ids)
     end
@@ -1208,18 +1208,6 @@ class User < ActiveRecord::Base
     ], remove_duplicates: false)
   end
 
-  def ci_projects_union
-    manageable_other_projects = projects.where(members: {
-      access_level: [Gitlab::Access::MASTER, Gitlab::Access::OWNER]
-    })
-
-    Gitlab::SQL::Union.new([
-      manageable_group_projects.select(:id),
-      personal_projects.select(:id),
-      manageable_other_projects.select(:id)
-    ])
-  end
-
   # Added according to https://github.com/plataformatec/devise/blob/7df57d5081f9884849ca15e4fde179ef164a575f/README.md#activejob-integration
   def send_devise_notification(notification, *args)
     return true unless can?(:receive_notifications)