Merge bitcoin/bitcoin#22004: fuzz: Speed up transaction fuzz target

bbbb518 fuzz: Speed up transaction fuzz target (MarcoFalke)

Pull request description:

  `hashBlock` and `include_addresses` are orthogonal, so no need to do an exhaustive "search".

  Might fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34491

ACKs for top commit:
  practicalswift:
    cr ACK bbbb518: patch looks correct, and `TxToUniv` surprisingly wide in the `transaction_fuzz_target` flame graph! Putting it on a diet makes sense.

Tree-SHA512: 1e7c30c7fecf96364a9a1597c0a22139389fdeb67db59f3c2c6fc088196e3332877b2865991a957980d542f99a2f48cc066dd7cc16c695a5113190fe06205089

src/test/fuzz/transaction.cpp

@@ -103,9 +103,6 @@ FUZZ_TARGET_INIT(transaction, initialize_transaction)
     (void)IsWitnessStandard(tx, coins_view_cache);
 
     UniValue u(UniValue::VOBJ);
-    TxToUniv(tx, /* hashBlock */ {}, /* include_addresses */ true, u);
-    TxToUniv(tx, /* hashBlock */ {}, /* include_addresses */ false, u);
-    static const uint256 u256_max(uint256S("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"));
-    TxToUniv(tx, u256_max, /* include_addresses */ true, u);
-    TxToUniv(tx, u256_max, /* include_addresses */ false, u);
+    TxToUniv(tx, /* hashBlock */ uint256::ZERO, /* include_addresses */ true, u);
+    TxToUniv(tx, /* hashBlock */ uint256::ONE, /* include_addresses */ false, u);
 }