After https://crrev.com/c/3416191 there are too many mixed concerns in
the clusterfuzz directory. We split it into js-fuzzer, foozzie and
trials.

Change-Id: I9a21ee83985e6113d77acba4583e99df88723c60
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3443505
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78981}