Fix spec and changelog

changelogs/unreleased/fix-build-group-name.yml

-+---
-+title: Simplify Build Group name correction
-+merge_request: 57739
-+author:
-+type: fixed
+---
+title: Simplify Build Group name correction
+merge_request: 57739
+author:
+type: fixed

spec/serializers/ci/dag_pipeline_entity_spec.rb

@@ -76,8 +76,8 @@ RSpec.describe Ci::DagPipelineEntity do
       it 'performs the smallest number of queries', :request_store do
         log = ActiveRecord::QueryRecorder.new { subject }
 
-        # stages, project, builds, build_needs, feature_flag
-        expect(log.count).to eq 5
+        # stages, project, builds, build_needs
+        expect(log.count).to eq 4
       end
 
       it 'contains all the data' do