Revert "[inspector] Enable async stack tagging API by default"

This reverts commit 4bab7a8e.

Reason for revert: Breaks chromium integration, blocking the roll: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Blink%20Linux%20Debug/15697/overview

Original change's description:
> [inspector] Enable async stack tagging API by default
>
> R=​bmeurer@chromium.org
>
> Fixed: chromium:1334585
> Change-Id: Id79a60bac1731ea9c60654ff15c8e23f958c6e57
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3799431
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82161}

Change-Id: I1918c5c14d17d724b7836e04eb4a64d034c2af9b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804697
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82182}

src/flags/flag-definitions.h

@@ -1670,7 +1670,7 @@ DEFINE_BOOL(
     "print debug messages for side-effect-free debug-evaluate for testing")
 DEFINE_BOOL(hard_abort, true, "abort by crashing")
 
-DEFINE_BOOL(experimental_async_stack_tagging_api, true,
+DEFINE_BOOL(experimental_async_stack_tagging_api, false,
             "enable experimental async stacks tagging API")
 DEFINE_BOOL(experimental_value_unavailable, false,
             "enable experimental <value unavailable> in scopes")