Mark valid usecases for alert

app/assets/javascripts/index.js

@@ -255,6 +255,7 @@ $(document).ready(function () {
       fetch(url, { mode: "no-cors", signal: AbortSignal.timeout(5000) })
         .then(callback)
         .catch(function () {
+          // eslint-disable-next-line no-alert
           alert(I18n.t("site.index.remote_failed"));
         });
     }