Remove expiration_policy feature flag

- remove flag from helper
- adjust tests
- changelog file

app/helpers/projects_helper.rb

@@ -720,7 +720,6 @@ module ProjectsHelper
   end
 
   def settings_container_registry_expiration_policy_available?(project)
-    Feature.enabled?(:registry_retention_policies_settings, project) &&
     Gitlab.config.registry.enabled &&
       can?(current_user, :destroy_container_image, project)
   end

changelogs/unreleased/196843-remove-feature-flag.yml

+---
+title: Container Registry tag expiration policy settings
+merge_request: 25123
+author:
+type: added

spec/features/projects/settings/registry_settings_spec.rb

@@ -10,7 +10,6 @@ describe 'Project > Settings > CI/CD > Container registry tag expiration policy'
   before do
     sign_in(user)
     stub_container_registry_config(enabled: true)
-    stub_feature_flags(registry_retention_policies_settings: true)
   end
 
   context 'as owner' do
@@ -63,15 +62,4 @@ describe 'Project > Settings > CI/CD > Container registry tag expiration policy'
       expect(page).not_to have_selector('#js-registry-policies')
     end
   end
-
-  context 'when feature flag is disabled' do
-    before do
-      stub_feature_flags(registry_retention_policies_settings: false)
-      visit project_settings_ci_cd_path(project)
-    end
-
-    it 'does not exists' do
-      expect(page).not_to have_selector('#js-registry-policies')
-    end
-  end
 end