Change BuildTraceChunkFlushWorker's queue from pipeline_processing to pipeline_background

app/workers/all_queues.yml

@@ -52,6 +52,7 @@
 - pipeline_creation:create_pipeline
 - pipeline_creation:run_pipeline_schedule
 - pipeline_background:archive_trace
+- pipeline_background:ci_build_trace_chunk_flush
 - pipeline_default:build_coverage
 - pipeline_default:build_trace_sections
 - pipeline_default:pipeline_metrics
@@ -66,7 +67,6 @@
 - pipeline_processing:pipeline_update
 - pipeline_processing:stage_update
 - pipeline_processing:update_head_pipeline_for_merge_request
-- pipeline_processing:ci_build_trace_chunk_flush
 - repository_check:repository_check_clear
 - repository_check:repository_check_single_repository

app/workers/ci/build_trace_chunk_flush_worker.rb

 module Ci
   class BuildTraceChunkFlushWorker
     include ApplicationWorker
-
-    queue_namespace :pipeline_processing
+    include PipelineBackgroundQueue
     def perform(build_trace_chunk_id)
       ::Ci::BuildTraceChunk.find_by(id: build_trace_chunk_id).try do |build_trace_chunk|

spec/requests/api/runner_spec.rb

@@ -901,7 +901,7 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
             context 'when we resend full trace' do
               before do
-                patch_the_trace('BUILD TRACE appended appended hello')
+                patch_the_trace('BUILD TRACE appended appended hello', headers.merge({ 'Content-Range' => "0-32" }))
               end
               it 'succeeds with updating trace' do