This ensures that the unhandledrejection callback fires.

Bug: chromium:1219363
Change-Id: I367d9a90132443e8ec94c1db380b9ef3160625c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3326242Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78321}