lib: reduce overhead of SafePromiseAllSettledReturnVoid calls

It was simply calling `SafePromiseAllSettled`, which itself calls
`arrayToSafePromiseIterable` which wraps all promises into new
`SafePromise` object and wraps it into a `SafeArrayIterator`. Since we
don't care about the return value, we can take some shortcuts.

lib/internal/per_context/primordials.js

@@ -570,9 +570,17 @@ primordials.SafePromiseAllSettled = (promises, mapFn) =>
  * @param {(v: T|PromiseLike<T>, k: number) => U|PromiseLike<U>} [mapFn]
  * @returns {Promise<void>}
  */
-primordials.SafePromiseAllSettledReturnVoid = async (promises, mapFn) => {
-  await primordials.SafePromiseAllSettled(promises, mapFn);
-};
+primordials.SafePromiseAllSettledReturnVoid = (promises, mapFn) => new Promise((resolve) => {
+  let pendingPromises = promises.length;
+  if (pendingPromises === 0) resolve();
+  const onSettle = () => {
+    if (--pendingPromises === 0) resolve();
+  };
+  for (let i = 0; i < promises.length; i++) {
+    const promise = mapFn != null ? mapFn(promises[i], i) : promises[i];
+    PromisePrototypeThen(PromiseResolve(promise), onSettle, onSettle);
+  }
+});
 
 /**
  * @template T,U