Cleanup feature flag "reference_cache_memoization"

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/341849

Remove FF "reference_cache_memoization"

Changelog: other

config/feature_flags/development/reference_cache_memoization.yml

----
-name: reference_cache_memoization
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/71310
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/341849
-milestone: '14.4'
-type: development
-group: group::source code
-default_enabled: true

lib/banzai/filter/references/reference_cache.rb

@@ -29,7 +29,7 @@ module Banzai
           @references_per_parent[parent_type] ||= begin
             refs = Hash.new { |hash, key| hash[key] = Set.new }
 
-            prepare_doc_for_scan(filter.doc).to_enum(:scan, regex).each do
+            prepare_doc_for_scan.to_enum(:scan, regex).each do
               parent_path = if parent_type == :project
                               full_project_path($~[:namespace], $~[:project])
                             else
@@ -184,14 +184,12 @@ module Banzai
           Gitlab::SafeRequestStore["banzai_#{parent_type}_refs".to_sym] ||= {}
         end
 
-        def prepare_doc_for_scan(doc)
-          html = if Feature.enabled?(:reference_cache_memoization, project, default_enabled: :yaml)
-                   result[:rendered_html] ||= doc.to_html
-                 else
-                   doc.to_html
+        def prepare_doc_for_scan
+          filter.requires_unescaping? ? unescape_html_entities(html_content) : html_content
         end
 
-          filter.requires_unescaping? ? unescape_html_entities(html) : html
+        def html_content
+          result[:rendered_html] ||= filter.doc.to_html
         end
 
         def unescape_html_entities(text)

spec/lib/banzai/filter/references/reference_cache_spec.rb

@@ -35,18 +35,6 @@ RSpec.describe Banzai::Filter::References::ReferenceCache do
 
         subject
       end
-
-      context 'when feature flag is disabled' do
-        before do
-          stub_feature_flags(reference_cache_memoization: false)
-        end
-
-        it 'ignores memoized rendered HTML' do
-          expect(doc).to receive(:to_html).and_call_original
-
-          subject
-        end
-      end
     end
 
     context 'when result is not available' do