Revert "Mark console-uncaught-promise.js as flaky"

This reverts commit d94504bd.

Reason for revert: Need to revert to see if tentative fix
https://crrev.com/c/3123760 is effective.

Original change's description:
> Mark console-uncaught-promise.js as flaky
>
> Bug: 1244038
> Change-Id: I60704b9279330766de2ff72194305822c13cd39b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3123424
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#915922}

Bug: 1244038
Change-Id: I87bcf8d2ed453db87035bd9d13aef522fadf04b5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3122098
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/main@{#915935}