Show domain_blacklist and domain_whitelist in the settings API

app/controllers/admin/application_settings_controller.rb

@@ -86,6 +86,8 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
     params[:application_setting][:import_sources]&.delete("")
     params[:application_setting][:restricted_visibility_levels]&.delete("")
     params.delete(:domain_blacklist_raw) if params[:domain_blacklist_file]
+    params.delete(:domain_blacklist_raw) if params[:domain_blacklist]
+    params.delete(:domain_whitelist_raw) if params[:domain_whitelist]
 
     params.require(:application_setting).permit(
       visible_application_setting_attributes

app/helpers/application_settings_helper.rb

@@ -180,9 +180,11 @@ module ApplicationSettingsHelper
       :default_projects_limit,
       :default_snippet_visibility,
       :disabled_oauth_sign_in_sources,
+      :domain_blacklist,
       :domain_blacklist_enabled,
-      :domain_blacklist_raw,
-      :domain_whitelist_raw,
+      :domain_blacklist_raw, # TODO: remove in API v5
+      :domain_whitelist,
+      :domain_whitelist_raw, # TODO: remove in API v5
       :outbound_local_requests_whitelist_raw,
       :dsa_key_restriction,
       :ecdsa_key_restriction,