test: remove incorrect debug() in test-policy-integrity

The instructions to use `test:policy-integrity:NUMBER` do not work, I'm
afraid. This removes them.

PR-URL: #34961
Reviewed-By: Ujjwal Sharma <ryzokuken@disroot.org>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Andrey Pechkurov <apechkurov@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/pummel/test-policy-integrity.js

@@ -380,9 +380,7 @@ for (const permutation of permutations({
   );
 }
 debug(`spawning ${tests.size} policy integrity permutations`);
-debug(
-  'use NODE_DEBUG=test:policy-integrity:NUMBER to log a specific permutation'
-);
+
 for (const config of tests) {
   const parsed = JSON.parse(config);
   tests.delete(config);