fuzz: add basic TxOrphanage::EraseForBlock cov #31918

 198 | @@ -195,6 +199,20 @@ FUZZ_TARGET(txorphan, .init = initialize_orphanage)
 199 |                      Assert(!orphanage.HaveTxFromPeer(tx->GetWitnessHash(), peer_id));
 200 |                      Assert(orphanage.UsageByPeer(peer_id) == 0);
 201 |                  },
 202 | +                [&] {
 203 | +                    // Make a block out of txs and then EraseForBlock
 204 | +                    CBlock block;
 205 | +                    int num_txs = fuzzed_data_provider.ConsumeIntegralInRange<unsigned int>(0, 1000);
 206 | +                    for (int i{0}; i < num_txs; ++i) {
 207 | +                        auto& tx_to_remove = PickValue(fuzzed_data_provider, tx_history);

glozow commented at 4:14 PM on February 24, 2025:

Maybe would have been cool to make the fuzzer generate a tx, that way can have non-identical but conflicting txns.