Revert of Temporarily skip debugger/debug/es8/async-function-debug-scopes...

Revert of Temporarily skip debugger/debug/es8/async-function-debug-scopes test. (patchset #1 id:1 of https://codereview.chromium.org/2636473002/ )

Reason for revert:
Inspector doesn't call any JS on async event any more.

https://codereview.chromium.org/2623313005/

Original issue's description:
> Temporarily skip debugger/debug/es8/async-function-debug-scopes test.
>
> BUG=v8:5837
> NOTRY=true
>
> Review-Url: https://codereview.chromium.org/2636473002
> Cr-Commit-Position: refs/heads/master@{#42319}
> Committed: https://chromium.googlesource.com/v8/v8/+/93aca16937b131dd735ed0b087fd4d17d0004adb

TBR=machenbach@chromium.org,ishell@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5837

Review-Url: https://codereview.chromium.org/2637533002
Cr-Commit-Position: refs/heads/master@{#42345}

test/debugger/debugger.status

@@ -25,9 +25,6 @@
   # parameter value
   'debug/es6/debug-scope-default-param-with-eval': [FAIL],
 
-  # Issue 5837: Investigate flakiness.
-  'debug/es8/async-function-debug-scopes': [SKIP],
-
   # Slow test
   'debug/debug-scopes': [PASS, SLOW],