ci: Fix CI not testing with Postgres 16 and flaky test (#9210)

src/TestUtils.js

@@ -26,3 +26,19 @@ export function destroyAllDataPermanently(fast) {
     })
   );
 }
+
+export function resolvingPromise() {
+  let res;
+  let rej;
+  const promise = new Promise((resolve, reject) => {
+    res = resolve;
+    rej = reject;
+  });
+  promise.resolve = res;
+  promise.reject = rej;
+  return promise;
+}
+
+export function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}