add cli for --accounts-hash-num-passes (#20827)

core/src/accounts_hash_verifier.rs

@@ -135,6 +135,7 @@ impl AccountsHashVerifier {
                 false,
                 None,
                 None, // this will fail with filler accounts
+                None, // this code path is only for testing, so use default # passes here
             )
             .unwrap();