Revert of [ESNext] Activate async/await for ClusterFuzz (patchset #1 id:1 of https://codereview.chromium.org/1992173002/ )

Reason for revert:
First CF feedback is in, reverting for now until the know bugs are fixed.

Original issue's description:
> [ESNext] Activate async/await for ClusterFuzz
>
> BUG=v8:4483
> R=neis@chromium.org,littledan@chromium.org,caitpotter88@gmail.com
> LOG=N
>
> Committed: https://crrev.com/c57cadfa09fa493141bf43c1c7b898187a71da19
> Cr-Commit-Position: refs/heads/master@{#36362}

TBR=littledan@chromium.org,caitpotter88@gmail.com,neis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4483

Review-Url: https://codereview.chromium.org/2003503002
Cr-Commit-Position: refs/heads/master@{#36397}