Remove the nuget new file reader feature flag

Update the related specs
Remove the feature flag yaml definition file

Changelog: other

app/services/packages/nuget/metadata_extraction_service.rb

@@ -105,22 +105,6 @@ module Packages
       end
 
       def with_zip_file(&block)
-        if ::Feature.enabled?(:packages_nuget_archive_new_file_reader, project, default_enabled: :yaml)
-          with_new_file_reader(&block)
-        else
-          with_legacy_file_reader(&block)
-        end
-      end
-
-      def with_legacy_file_reader
-        package_file.file.use_file do |file_path|
-          Zip::File.open(file_path) do |zip_file|
-            yield(zip_file)
-          end
-        end
-      end
-
-      def with_new_file_reader
         package_file.file.use_open_file do |open_file|
           zip_file = Zip::File.new(open_file, false, true)
           yield(zip_file)

config/feature_flags/development/packages_nuget_archive_new_file_reader.yml

----
-name: packages_nuget_archive_new_file_reader
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62471
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/331799
-milestone: '13.13'
-type: development
-group: group::package
-default_enabled: false

spec/services/packages/nuget/metadata_extraction_service_spec.rb

@@ -24,22 +24,7 @@ RSpec.describe Packages::Nuget::MetadataExtractionService do
         package_tags: []
       }
 
-      context 'with packages_nuget_archive_new_file_reader enabled' do
-        before do
-          expect(service).to receive(:with_new_file_reader).and_call_original
-        end
-
-        it { is_expected.to eq(expected_metadata) }
-      end
-
-      context 'with packages_nuget_archive_new_file_reader disabled' do
-        before do
-          stub_feature_flags(packages_nuget_archive_new_file_reader: false)
-          expect(service).to receive(:with_legacy_file_reader).and_call_original
-        end
-
-        it { is_expected.to eq(expected_metadata) }
-      end
+      it { is_expected.to eq(expected_metadata) }
     end
 
     context 'with nuspec file' do