Remove merge_request_short_pipeline_serializer FF

app/serializers/merge_request_poll_widget_entity.rb

@@ -20,19 +20,11 @@ class MergeRequestPollWidgetEntity < Grape::Entity
   expose :merge_user, using: UserEntity
 
   expose :actual_head_pipeline, as: :pipeline, if: -> (mr, _) { presenter(mr).can_read_pipeline? } do |merge_request, options|
-    if Feature.enabled?(:merge_request_short_pipeline_serializer, merge_request.project, default_enabled: true)
-      MergeRequests::PipelineEntity.represent(merge_request.actual_head_pipeline, options)
-    else
-      PipelineDetailsEntity.represent(merge_request.actual_head_pipeline, options)
-    end
+    MergeRequests::PipelineEntity.represent(merge_request.actual_head_pipeline, options)
   end
 
   expose :merge_pipeline, if: ->(mr, _) { mr.merged? && can?(request.current_user, :read_pipeline, mr.target_project)} do |merge_request, options|
-    if Feature.enabled?(:merge_request_short_pipeline_serializer, merge_request.project, default_enabled: true)
-      MergeRequests::PipelineEntity.represent(merge_request.merge_pipeline, options)
-    else
-      PipelineDetailsEntity.represent(merge_request.merge_pipeline, options)
-    end
+    MergeRequests::PipelineEntity.represent(merge_request.merge_pipeline, options)
   end
 
   expose :default_merge_commit_message

config/feature_flags/development/merge_request_short_pipeline_serializer.yml

----
-name: merge_request_short_pipeline_serializer
-introduced_by_url: 
-rollout_issue_url: 
-group: 
-type: development
-default_enabled: true

spec/serializers/merge_request_poll_widget_entity_spec.rb

@@ -44,20 +44,6 @@ RSpec.describe MergeRequestPollWidgetEntity do
         expect(subject[:merge_pipeline]).to eq(pipeline_payload)
       end
 
-      context 'when merge_request_short_pipeline_serializer is disabled' do
-        it 'returns detailed info about pipeline' do
-          stub_feature_flags(merge_request_short_pipeline_serializer: false)
-
-          pipeline.reload
-          pipeline_payload =
-            PipelineDetailsEntity
-              .represent(pipeline, request: request)
-              .as_json
-
-          expect(subject[:merge_pipeline]).to eq(pipeline_payload)
-        end
-      end
-
       context 'when user cannot read pipelines on target project' do
         before do
           project.add_guest(user)
@@ -245,19 +231,6 @@ RSpec.describe MergeRequestPollWidgetEntity do
           expect(subject[:pipeline]).to eq(pipeline_payload)
         end
 
-        context 'when merge_request_short_pipeline_serializer is disabled' do
-          it 'returns detailed info about pipeline' do
-            stub_feature_flags(merge_request_short_pipeline_serializer: false)
-
-            pipeline_payload =
-              PipelineDetailsEntity
-                .represent(pipeline, request: req)
-                .as_json
-
-            expect(subject[:pipeline]).to eq(pipeline_payload)
-          end
-        end
-
         it 'returns ci_status' do
           expect(subject[:ci_status]).to eq('pending')
         end