Enable repository API rate limit cache

Changelog: performance

config/feature_flags/development/api_caching_rate_limit_repository_compare.yml

----
-name: api_caching_rate_limit_repository_compare
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/64407
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334264
-milestone: '14.1'
-type: development
-group: group::source code
-default_enabled: true

lib/api/repositories.rb

@@ -171,7 +171,6 @@ module API
         optional :straight, type: Boolean, desc: 'Comparison method, `true` for direct comparison between `from` and `to` (`from`..`to`), `false` to compare using merge base (`from`...`to`)', default: false
       end
       get ':id/repository/compare', urgency: :low do
-        ff_enabled = Feature.enabled?(:api_caching_rate_limit_repository_compare, user_project, default_enabled: :yaml)
         target_project = fetch_target_project(current_user, user_project, params)
 
         if target_project.blank?
@@ -180,7 +179,7 @@ module API
 
         cache_key = compare_cache_key(current_user, user_project, target_project, declared_params)
 
-        cache_action_if(ff_enabled, cache_key, expires_in: 1.minute) do
+        cache_action(cache_key, expires_in: 1.minute) do
           compare = CompareService.new(user_project, params[:to]).execute(target_project, params[:from], straight: params[:straight])
 
           if compare

spec/requests/api/repositories_spec.rb

@@ -561,17 +561,6 @@ RSpec.describe API::Repositories do
         let(:request) { get api(route, guest) }
       end
     end
-
-    context 'api_caching_rate_limit_repository_compare is disabled' do
-      before do
-        stub_feature_flags(api_caching_rate_limit_repository_compare: false)
-      end
-
-      it_behaves_like 'repository compare' do
-        let(:project) { create(:project, :public, :repository) }
-        let(:current_user) { nil }
-      end
-    end
   end
 
   describe 'GET /projects/:id/repository/contributors' do