More consistent impl of flushPromises

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/utility-features/test-utils/src/flush-promises.ts

@@ -2,6 +2,9 @@
  * Copyright (c) OpenLens Authors. All rights reserved.
  * Licensed under MIT License. See LICENSE in root directory for more information.
  */
-import { setImmediate } from "timers";
+import { setImmediate, setTimeout } from "timers/promises";
 
-export const flushPromises = () => new Promise(setImmediate);
+export const flushPromises = async () => {
+  await setImmediate();
+  await setTimeout(5);
+};