Add an additional preload to prevent n+1 in new project page

Changelog: performance
EE: true

ee/app/helpers/ee/projects_helper.rb

@@ -382,6 +382,7 @@ def preloaded_projects(group_id)
       projects = projects_not_aimed_for_deletions_for(group_id)
 
       ::Preloaders::ProjectPolicyPreloader.new(projects, current_user).execute
+      ::Preloaders::ProjectRootAncestorPreloader.new(projects).execute
 
       projects
     end

ee/spec/helpers/projects_helper_spec.rb

@@ -157,6 +157,7 @@
 
     it 'preloads the policy requirements' do
       expect(::Preloaders::ProjectPolicyPreloader).to receive(:new).with(kind_of(ActiveRecord::Relation), user).and_call_original
+      expect(::Preloaders::ProjectRootAncestorPreloader).to receive(:new).at_least(:once).and_call_original
 
       helper.group_project_templates_count(parent_group.id)
     end