Mark daily code coverage worker as idempotent

app/workers/all_queues.yml

@@ -611,7 +611,7 @@
   :urgency: :default
   :resource_boundary: :unknown
   :weight: 1
-  :idempotent: 
+  :idempotent: true
 - :name: pipeline_cache:expire_job_cache
   :feature_category: :continuous_integration
   :has_external_dependencies: 

app/workers/ci/daily_code_coverage_worker.rb

@@ -5,6 +5,8 @@ module Ci
     include ApplicationWorker
     include PipelineBackgroundQueue
 
+    idempotent!
+
     def perform(pipeline_id)
       Ci::Pipeline.find_by_id(pipeline_id).try do |pipeline|
         Ci::DailyCodeCoverageService.new.execute(pipeline)