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

spec/support/testUtils.js

@@ -1,18 +0,0 @@
-// Create Deferred Promise
-function resolvingPromise() {
-  let res;
-  let rej;
-  const promise = new Promise((resolve, reject) => {
-    res = resolve;
-    rej = reject;
-  });
-  promise.resolve = res;
-  promise.reject = rej;
-  return promise;
-}
-
-function sleep(ms) {
-  return new Promise((resolve) => setTimeout(resolve, ms));
-}
-
-module.exports = { resolvingPromise, sleep };