Many tests have a long execution time already, and running them in
stress mode is unlikely to flush out bugs (spec tests are supposed to
check for spec-conform behaviour, and this is unlikely to change if run
multiple times).

R=jkummerow@chromium.org

Bug: v8:13195
Change-Id: I029102e31f1e2e240e02376fbd5cd40ff0acc07a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3852488Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82703}