Merge branch 'use-queue_namespace' into 'master'

Use queue_namespace rather than enqueue_in

See merge request gitlab-org/gitlab-ce!15989

app/workers/all_queues.yml

@@ -39,6 +39,7 @@
 - pipeline_cache:expire_job_cache
 - pipeline_cache:expire_pipeline_cache
 - pipeline_creation:create_pipeline
+- pipeline_creation:run_pipeline_schedule
 - pipeline_default:build_coverage
 - pipeline_default:build_trace_sections
 - pipeline_default:pipeline_metrics

app/workers/run_pipeline_schedule_worker.rb

@@ -2,7 +2,7 @@ class RunPipelineScheduleWorker
   include ApplicationWorker
   include PipelineQueue
 
-  enqueue_in group: :creation
+  queue_namespace :pipeline_creation
 
   def perform(schedule_id, user_id)
     schedule = Ci::PipelineSchedule.find_by(id: schedule_id)