remove blink_test

TestExpectations has been empty for almost 3 years and its
use in v8 is not documented.

Change-Id: I9cf51ddf0934869ed3ba6214b8d6a383dab8a11c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3281260Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/main@{#77892}