Enable one-by-one build queuing iteration by default

app/services/ci/register_job_service.rb

@@ -105,7 +105,7 @@ module Ci
         builds = builds.queued_before(params[:job_age].seconds.ago)
       end
 
-      if Feature.enabled?(:ci_register_job_service_one_by_one, runner)
+      if Feature.enabled?(:ci_register_job_service_one_by_one, runner, default_enabled: true)
         build_ids = builds.pluck(:id)
 
         @metrics.observe_queue_size(-> { build_ids.size })

config/feature_flags/development/ci_register_job_service_one_by_one.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/323177
 milestone: '13.10'
 type: development
 group: group::memory
-default_enabled: false
+default_enabled: true