Remove design_management_resize_images flag

https://gitlab.com/gitlab-org/gitlab/-/issues/207351/

ee/app/workers/design_management/new_version_worker.rb

@@ -25,8 +25,6 @@ module DesignManagement
     end
 
     def generate_image_versions(version)
-      return unless ::Feature.enabled?(:design_management_resize_images, version.project)
-
       DesignManagement::GenerateImageVersionsService.new(version).execute
     end
   end

ee/changelogs/unreleased/207351-remove-design_management_resize_images-feature-flag.yml

+---
+title: Generate smaller versions of Design Management design files
+merge_request: 29215
+author:
+type: added

ee/spec/workers/design_management/new_version_worker_spec.rb

@@ -6,10 +6,6 @@ describe DesignManagement::NewVersionWorker do
   describe '#perform' do
     let(:worker) { described_class.new }
 
-    before do
-      stub_feature_flags(design_management_resize_images: true)
-    end
-
     context 'the id is wrong or out-of-date' do
       let(:version_id) { -1 }
 
@@ -53,18 +49,6 @@ describe DesignManagement::NewVersionWorker do
 
         worker.perform(version.id)
       end
-
-      context 'when the `design_management_resize_images` flag is disabled' do
-        before do
-          stub_feature_flags(design_management_resize_images: false)
-        end
-
-        it 'does not invoke GenerateImageVersionsService' do
-          expect(DesignManagement::GenerateImageVersionsService).not_to receive(:new)
-
-          worker.perform(version.id)
-        end
-      end
     end
 
     context 'the version includes multiple types of action' do