test: unset NODE_OPTIONS for cctest

The test may fail otherwise because of behaviour changes caused
by setting the environment variable.

Fixes: https://github.com/nodejs/node/issues/31585

PR-URL: https://github.com/nodejs/node/pull/31594


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>