Add highlight_js feature flag

Add a feature flag for syntax highlighting using HighlightJS

app/assets/javascripts/repository/components/blob_viewers/index.js

@@ -3,7 +3,7 @@ export const loadViewer = (type) => {
     case 'empty':
       return () => import(/* webpackChunkName: 'blob_empty_viewer' */ './empty_viewer.vue');
     case 'text':
-      return gon.features.refactorTextViewer
+      return gon.features.highlightJs
         ? () => import(/* webpackChunkName: 'blob_text_viewer' */ './text_viewer.vue')
         : null;
     case 'download':

app/controllers/projects/blob_controller.rb

@@ -44,7 +44,7 @@ class Projects::BlobController < Projects::ApplicationController
 
   before_action do
     push_frontend_feature_flag(:refactor_blob_viewer, @project, default_enabled: :yaml)
-    push_frontend_feature_flag(:refactor_text_viewer, @project, default_enabled: :yaml)
+    push_frontend_feature_flag(:highlight_js, @project, default_enabled: :yaml)
     push_frontend_feature_flag(:consolidated_edit_button, @project, default_enabled: :yaml)
     push_licensed_feature(:file_locks) if @project.licensed_feature_available?(:file_locks)
   end

app/controllers/projects_controller.rb

@@ -35,7 +35,7 @@ class ProjectsController < Projects::ApplicationController
   before_action do
     push_frontend_feature_flag(:lazy_load_commits, @project, default_enabled: :yaml)
     push_frontend_feature_flag(:refactor_blob_viewer, @project, default_enabled: :yaml)
-    push_frontend_feature_flag(:refactor_text_viewer, @project, default_enabled: :yaml)
+    push_frontend_feature_flag(:highlight_js, @project, default_enabled: :yaml)
     push_frontend_feature_flag(:increase_page_size_exponentially, @project, default_enabled: :yaml)
     push_frontend_feature_flag(:new_dir_modal, @project, default_enabled: :yaml)
   end

config/feature_flags/development/refactor_text_viewer.yml → config/feature_flags/development/highlight_js.yml

 ---
-name: refactor_text_viewer
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/70909
-rollout_issue_url:
-milestone: '14.4'
+name: highlight_js
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/75005
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/346257
+milestone: '14.6'
 type: development
-group: 'group::source code'
+group: group::source code
 default_enabled: false

spec/frontend/repository/components/blob_content_viewer_spec.js

@@ -98,7 +98,7 @@ describe('Blob content viewer component', () => {
   const findForkSuggestion = () => wrapper.findComponent(ForkSuggestion);
 
   beforeEach(() => {
-    gon.features = { refactorTextViewer: true };
+    gon.features = { highlightJs: true };
     isLoggedIn.mockReturnValue(true);
   });