graph/db: add version parameter to IsZombieEdge

Make IsZombieEdge version-aware and add corresponding method to
VersionedGraph. Convert TestEdgeInsertionDeletion to versioned test
using the createEdge helper for both v1 and v2 channel testing.

graph/db/kv_store.go

@@ -4257,14 +4257,19 @@ func (c *KVStore) markEdgeLiveUnsafe(tx kvdb.RwTx, chanID uint64) error {
 // IsZombieEdge returns whether the edge is considered zombie. If it is a
 // zombie, then the two node public keys corresponding to this edge are also
 // returned.
-func (c *KVStore) IsZombieEdge(chanID uint64) (bool, [33]byte, [33]byte,
-	error) {
+func (c *KVStore) IsZombieEdge(v lnwire.GossipVersion,
+	chanID uint64) (bool, [33]byte, [33]byte, error) {
 
 	var (
 		isZombie         bool
 		pubKey1, pubKey2 [33]byte
 	)
 
+	if v != lnwire.GossipVersion1 {
+		return false, [33]byte{}, [33]byte{},
+			ErrVersionNotSupportedForKVDB
+	}
+
 	err := kvdb.View(c.db, func(tx kvdb.RTx) error {
 		edges := tx.ReadBucket(edgeBucket)
 		if edges == nil {