API for updating attribution domains (#32730)

app/controllers/settings/verifications_controller.rb

@@ -18,7 +18,9 @@ class Settings::VerificationsController < Settings::BaseController
   private
 
   def account_params
-    params.require(:account).permit(:attribution_domains_as_text)
+    params.require(:account).permit(:attribution_domains).tap do |params|
+      params[:attribution_domains] = params[:attribution_domains].split if params[:attribution_domains]
+    end
   end
 
   def set_account