These tests were written a long time ago, and use the allocation of
large amounts of unused memory as a way to detect use-after-free
problems with Buffers. As a result, the tests are resource-intensive
and may crash because of that.

Replace them with a more modern test. We don’t explicitly try to
*detect* use-after-free conditions, and instead rely on e.g. ASAN
(or the process just crashing hard) to do that for us.

Fixes: nodejs#34527

Co-authored-by: Rich Trott <[email protected]>