Fix flaky IAP flow test: spurious async and mock delays (#32)

Agent-Logs-Url: https://github.com/damus-io/api/sessions/9ac7edf6-1445-487b-8ab5-4e8a3fac7d03
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: danieldaquino <24692108+danieldaquino@users.noreply.github.com>

Author: Copilot

src/iap_refresh_management.js

@@ -43,7 +43,7 @@ async function update_iap_history_with_apple_if_needed_and_return_updated_user(a
   }
 }
 
-async function should_iap_transaction_history_be_refreshed(account) {
+function should_iap_transaction_history_be_refreshed(account) {
   const account_active = (account.expiry && current_time() < account.expiry) ? true : false;
   const last_transaction = account.transactions[account.transactions.length - 1];
   if (account_active || last_transaction == undefined || last_transaction.type != "iap") {