Utilize load balancing for BuildQueueWorker

Update BuildQueueWorker to utilize readonly database replicas.

Changelog: performance

app/workers/build_queue_worker.rb

@@ -10,7 +10,7 @@ class BuildQueueWorker # rubocop:disable Scalability/IdempotentWorker
   feature_category :continuous_integration
   urgency :high
   worker_resource_boundary :cpu
-  data_consistency :sticky, feature_flag: :load_balancing_for_build_queue_worker
+  data_consistency :sticky
 
   # rubocop: disable CodeReuse/ActiveRecord
   def perform(build_id)

config/feature_flags/development/load_balancing_for_build_queue_worker.yml

----
-name: load_balancing_for_build_queue_worker
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/63212
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/332586
-milestone: '14.0'
-type: development
-group: group::memory
-default_enabled: false

spec/workers/build_queue_worker_spec.rb

@@ -26,6 +26,5 @@ RSpec.describe BuildQueueWorker do
 
   it_behaves_like 'worker with data consistency',
                   described_class,
-                  feature_flag: :load_balancing_for_build_queue_worker,
                   data_consistency: :sticky
 end