Adds data consistency for BuildHooksWorker

- Introduces load_balancing_for_build_hooks_worker ff

app/workers/build_hooks_worker.rb

@@ -7,6 +7,7 @@ class BuildHooksWorker # rubocop:disable Scalability/IdempotentWorker
   queue_namespace :pipeline_hooks
   feature_category :continuous_integration
   urgency :high
+  data_consistency :delayed, feature_flag: :load_balancing_for_build_hooks_worker
 
   # rubocop: disable CodeReuse/ActiveRecord
   def perform(build_id)

config/feature_flags/development/load_balancing_for_build_hooks_worker.yml

+---
+name: load_balancing_for_build_hooks_worker
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/57575
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/326095
+milestone: '13.11'
+type: development
+group: group::memory
+default_enabled: false

spec/support/shared_examples/workers/worker_with_data_consistency_shared_example.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'worker with data consistency' do |worker_class, data_consistency: :always, feature_flag: nil|
+  describe '.get_data_consistency_feature_flag_enabled?' do
+    it 'returns true' do
+      expect(worker_class.get_data_consistency_feature_flag_enabled?).to be(true)
+    end
+
+    if feature_flag
+      context "when feature flag :#{feature_flag} is disabled" do
+        before do
+          stub_feature_flags(feature_flag => false)
+        end
+
+        it 'returns false' do
+          expect(worker_class.get_data_consistency_feature_flag_enabled?).to be(false)
+        end
+      end
+    end
+  end
+
+  describe '.get_data_consistency' do
+    it 'returns correct data consistency' do
+      expect(worker_class.get_data_consistency).to eq(data_consistency)
+    end
+  end
+end

spec/workers/build_hooks_worker_spec.rb

@@ -22,4 +22,9 @@ RSpec.describe BuildHooksWorker do
       end
     end
   end
+
+  it_behaves_like 'worker with data consistency',
+                  described_class,
+                  feature_flag: :load_balancing_for_build_hooks_worker,
+                  data_consistency: :delayed
 end