[p2p] only attempt 1p1c when both txns provided by the same peer

Now that we track all announcers of an orphan, it's not helpful to
consider an orphan provided by a peer that didn't send us this parent.
It can only hurt our chances of finding the right orphan when there are
multiple candidates.

Adapt the 2 tests in p2p_opportunistic_1p1c.py that looked at 1p1c
packages from different peers. Instead of checking that the right peer
is punished, we now check that the package is not submitted. We can't
use the functional test to see that the package was not considered
because the behavior is indistinguishable (except for the logs).

src/test/fuzz/txorphan.cpp

@@ -88,12 +88,6 @@ FUZZ_TARGET(txorphan, .init = initialize_orphanage)
                     return input.prevout.hash == ptx_potential_parent->GetHash();
                 }));
             }
-            for (const auto& [child, peer] : orphanage.GetChildrenFromDifferentPeer(ptx_potential_parent, peer_id)) {
-                assert(std::any_of(child->vin.cbegin(), child->vin.cend(), [&](const auto& input) {
-                    return input.prevout.hash == ptx_potential_parent->GetHash();
-                }));
-                assert(peer != peer_id);
-            }
         }
 
         // trigger orphanage functions