Make build trace chunks flush worker idempotent

app/workers/all_queues.yml

@@ -897,7 +897,7 @@
   :urgency: :low
   :resource_boundary: :unknown
   :weight: 1
-  :idempotent:
+  :idempotent: true
   :tags: []
 - :name: pipeline_background:ci_daily_build_group_report_results
   :feature_category: :continuous_integration

app/workers/ci/build_trace_chunk_flush_worker.rb

 # frozen_string_literal: true
 
 module Ci
-  class BuildTraceChunkFlushWorker # rubocop:disable Scalability/IdempotentWorker
+  class BuildTraceChunkFlushWorker
     include ApplicationWorker
     include PipelineBackgroundQueue
 
+    idempotent!
+
     # rubocop: disable CodeReuse/ActiveRecord
     def perform(chunk_id)
       ::Ci::BuildTraceChunk.find_by(id: chunk_id).try do |chunk|