This reverts commit 96f55796.

Reason for revert: breaks CI presubmit:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20presubmit/builds/22115

Original change's description:
> [test] Add test runner system tests for flaky tests
> 
> This uses a temporary file in the mocked d8 script to let d8 flip
> between FAIL and PASS on rerun.
> 
> This adds a separate test root with dedicated test suite for testing
> flakes to no interfere with existing status file configs.
> 
> NOTRY=true
> 
> Bug: v8:6917
> Change-Id: Id43753650195fb74cceb2a3ee9014100cabad546
> Reviewed-on: https://chromium-review.googlesource.com/867917
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#50621}

TBR=machenbach@chromium.org,sergiyb@chromium.org,majeski@google.com

Change-Id: I103bf8f0e926a3f56921f14bdd7e875ce839ea71
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6917
Reviewed-on: https://chromium-review.googlesource.com/868530Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50624}