- moved test data closer to tests
- removed the coverage related code
- refactored to remove boilerplate from test code

Bug: v8:12785
Change-Id: I1013d29d8ff2c3ecb786c294ae3b3ab6decdca20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3683610
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80921}