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