test: use common.buildType in embedding test

This un-breaks testing in the case of `./configure --debug-node`.

PR-URL: https://github.com/nodejs/node/pull/32422


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>