async function syncAllUsersWebcals() {
    try {
      const users = await gladys.user.get();

      await Promise.map(
        users,
        async (user) => {
          await calDavHandler.syncUserWebcals(user.id);
        },
        { concurrency: 2 },
      );
    } catch (e) {
      logger.error(e);
    }
  }
@public
@description This function sync webcals for all users.
@example
gladys.services.caldav.syncAllUsersWebcals();