test: use common.buildType in embedding test

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

Backport-PR-URL: #35241
PR-URL: #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>

test/embedding/test-embedding.js

@@ -6,8 +6,7 @@ const child_process = require('child_process');
 const path = require('path');
 
 common.allowGlobals(global.require);
-let binary = process.features.debug ?
-  'out/Debug/embedtest' : 'out/Release/embedtest';
+let binary = `out/${common.buildType}/embedtest`;
 if (common.isWindows) {
   binary += '.exe';
 }