This ensures that the unhandledrejection callback fires.

Bug: chromium:1219363
Change-Id: I184a728105863f9e207a603f2d45e26393c98796
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3322978
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78306}