build: use BUILDTYPE in bench-addons-build targets

This commit uses the BUILDTYPE for the benchmark targets that currently
explicitly use Release as the build type.

The motivation for this change is allows switching between debug builds
and release builds using the bench-addons-clean/bench-addons-build
targets.

PR-URL: https://github.com/nodejs/node/pull/24033


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>