Enable linear version `ci_owned_runners`

app/models/user.rb

@@ -1614,14 +1614,8 @@ class User < ApplicationRecord
         .joins(:runner)
         .select('ci_runners.*')
 
-      base_and_descendants = if Feature.enabled?(:linear_user_ci_owned_runners, self, default_enabled: :yaml)
-                               owned_groups.self_and_descendant_ids
-                             else
-                               Gitlab::ObjectHierarchy.new(owned_groups).base_and_descendants.select(:id)
-                             end
-
       group_runners = Ci::RunnerNamespace
-        .where(namespace_id: base_and_descendants)
+        .where(namespace_id: owned_groups.self_and_descendant_ids)
         .joins(:runner)
         .select('ci_runners.*')
 

config/feature_flags/development/linear_user_ci_owned_runners.yml

----
-name: linear_user_ci_owned_runners
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68848
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339435
-milestone: '14.6'
-type: development
-group: group::access
-default_enabled: false

spec/models/user_spec.rb

@@ -3723,7 +3723,6 @@ RSpec.describe User do
   end
 
   describe '#ci_owned_runners' do
-    shared_examples 'ci_owned_runners examples' do
     let(:user) { create(:user) }
 
     shared_examples :nested_groups_owner do
@@ -4030,17 +4029,6 @@ RSpec.describe User do
     end
   end
 
-    it_behaves_like 'ci_owned_runners examples'
-
-    context 'when feature flag :linear_user_ci_owned_runners is disabled' do
-      before do
-        stub_feature_flags(linear_user_ci_owned_runners: false)
-      end
-
-      it_behaves_like 'ci_owned_runners examples'
-    end
-  end
-
   describe '#projects_with_reporter_access_limited_to' do
     let(:project1) { create(:project) }
     let(:project2) { create(:project) }