test: refactor test/parallel/test-bootstrap-modules.js

This simplifies the test a bit by removing duplicated code and by
focusing the reader on the passed through module.

Signed-off-by: Ruben Bridgewater <ruben@bridgewater.de>

PR-URL: https://github.com/nodejs/node/pull/33282


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>