Removes load_balancing_for_expire_job_cache_worker FF

Changelog: added

app/workers/expire_job_cache_worker.rb

@@ -3,7 +3,7 @@
 class ExpireJobCacheWorker # rubocop:disable Scalability/IdempotentWorker
   include ApplicationWorker
 
-  data_consistency :delayed, feature_flag: :load_balancing_for_expire_job_cache_worker
+  data_consistency :delayed
 
   sidekiq_options retry: 3
   include PipelineQueue

config/feature_flags/development/load_balancing_for_expire_job_cache_worker.yml

----
-name: load_balancing_for_expire_job_cache_worker
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68791
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339137
-milestone: '14.3'
-type: development
-group: group::pipeline authoring
-default_enabled: false

spec/workers/expire_job_cache_worker_spec.rb

@@ -33,7 +33,6 @@ RSpec.describe ExpireJobCacheWorker do
 
       it_behaves_like 'worker with data consistency',
         described_class,
-        feature_flag: :load_balancing_for_expire_job_cache_worker,
         data_consistency: :delayed
     end