Remove `admin_approval_for_new_user_signups` feature check

This change remove
`admin_approval_for_new_user_signups` feature check while
permitting attributes in the controller/API

app/helpers/application_settings_helper.rb

@@ -167,7 +167,7 @@ module ApplicationSettingsHelper
   end
 
   def visible_attributes
-    attributes = [
+    [
       :abuse_notification_email,
       :after_sign_out_path,
       :after_sign_up_text,
@@ -265,6 +265,7 @@ module ApplicationSettingsHelper
       :receive_max_input_size,
       :repository_checks_enabled,
       :repository_storages_weighted,
+      :require_admin_approval_after_user_signup,
       :require_two_factor_authentication,
       :restricted_visibility_levels,
       :rsa_key_restriction,
@@ -331,9 +332,6 @@ module ApplicationSettingsHelper
       :wiki_page_max_content_bytes,
       :container_registry_delete_tags_service_timeout
     ]
-
-    attributes << :require_admin_approval_after_user_signup if Feature.enabled?(:admin_approval_for_new_user_signups)
-    attributes
   end
 
   def external_authorization_service_attributes

spec/controllers/admin/application_settings_controller_spec.rb

@@ -87,36 +87,11 @@ RSpec.describe Admin::ApplicationSettingsController do
       sign_in(admin)
     end
 
-    context 'require_admin_approval_after_user_signup setting' do
-      subject do
-        put :update, params: { application_setting: { require_admin_approval_after_user_signup: true } }
-      end
-
-      context 'when feature is enabled' do
-        before do
-          stub_feature_flags(admin_approval_for_new_user_signups: true)
-        end
-
-        it 'updates the require_admin_approval_after_user_signup setting' do
-          subject
-
-          expect(response).to redirect_to(general_admin_application_settings_path)
-          expect(ApplicationSetting.current.require_admin_approval_after_user_signup).to eq(true)
-        end
-      end
+    it 'updates the require_admin_approval_after_user_signup setting' do
+      put :update, params: { application_setting: { require_admin_approval_after_user_signup: true } }
 
-      context 'when feature is disabled' do
-        before do
-          stub_feature_flags(admin_approval_for_new_user_signups: false)
-        end
-
-        it 'does not update the require_admin_approval_after_user_signup setting' do
-          subject
-
-          expect(response).to redirect_to(general_admin_application_settings_path)
-          expect(ApplicationSetting.current.require_admin_approval_after_user_signup).not_to eq(true)
-        end
-      end
+      expect(response).to redirect_to(general_admin_application_settings_path)
+      expect(ApplicationSetting.current.require_admin_approval_after_user_signup).to eq(true)
     end
 
     it 'updates the password_authentication_enabled_for_git setting' do