Use linear version User#groups_with_developer_maintainer_project_access

Changelog: performance

app/models/user.rb

@@ -2117,9 +2117,12 @@ class User < ApplicationRecord
       project_creation_levels << nil
     end
 
+    if Feature.enabled?(:linear_user_groups_with_developer_maintainer_project_access, self, default_enabled: :yaml)
+      developer_groups.self_and_descendants.where(project_creation_level: project_creation_levels)
+    else
       developer_groups_hierarchy = ::Gitlab::ObjectHierarchy.new(developer_groups).base_and_descendants
-    ::Group.where(id: developer_groups_hierarchy.select(:id),
-                  project_creation_level: project_creation_levels)
+      ::Group.where(id: developer_groups_hierarchy.select(:id), project_creation_level: project_creation_levels)
+    end
   end
 
   def no_recent_activity?

config/feature_flags/development/linear_user_groups_with_developer_maintainer_project_access.yml

+---
+name: linear_user_groups_with_developer_maintainer_project_access
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68851
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339436
+milestone: '14.3'
+type: development
+group: group::access
+default_enabled: false

spec/models/user_spec.rb

@@ -5999,4 +5999,49 @@ RSpec.describe User do
       end
     end
   end
+
+  describe '#groups_with_developer_maintainer_project_access' do
+    let_it_be(:user) { create(:user) }
+    let_it_be(:group1) { create(:group) }
+
+    let_it_be(:developer_group1) do
+      create(:group).tap do |g|
+        g.add_developer(user)
+      end
+    end
+
+    let_it_be(:developer_group2) do
+      create(:group, project_creation_level: ::Gitlab::Access::DEVELOPER_MAINTAINER_PROJECT_ACCESS).tap do |g|
+        g.add_developer(user)
+      end
+    end
+
+    let_it_be(:guest_group1) do
+      create(:group, project_creation_level: ::Gitlab::Access::DEVELOPER_MAINTAINER_PROJECT_ACCESS).tap do |g|
+        g.add_guest(user)
+      end
+    end
+
+    let_it_be(:developer_group1) do
+      create(:group, project_creation_level: ::Gitlab::Access::DEVELOPER_MAINTAINER_PROJECT_ACCESS).tap do |g|
+        g.add_maintainer(user)
+      end
+    end
+
+    subject { user.send(:groups_with_developer_maintainer_project_access) }
+
+    shared_examples 'groups_with_developer_maintainer_project_access examples' do
+      specify { is_expected.to contain_exactly(developer_group2) }
+    end
+
+    it_behaves_like 'groups_with_developer_maintainer_project_access examples'
+
+    context 'when feature flag :linear_user_groups_with_developer_maintainer_project_access is disabled' do
+      before do
+        stub_feature_flags(linear_user_groups_with_developer_maintainer_project_access: false)
+      end
+
+      it_behaves_like 'groups_with_developer_maintainer_project_access examples'
+    end
+  end
 end