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/graph.go

@@ -735,7 +735,7 @@ func (c *ChannelGraph) ChannelView() ([]EdgePoint, error) {
 func (c *ChannelGraph) IsZombieEdge(chanID uint64) (bool, [33]byte, [33]byte,
 	error) {
 
-	return c.db.IsZombieEdge(chanID)
+	return c.db.IsZombieEdge(lnwire.GossipVersion1, chanID)
 }
 
 // NumZombies returns the current number of zombie channels in the graph.
@@ -806,6 +806,13 @@ func (c *VersionedGraph) FetchChannelEdgesByOutpoint(op *wire.OutPoint) (
 	return c.db.FetchChannelEdgesByOutpoint(c.v, op)
 }
 
+// IsZombieEdge returns whether the edge is considered zombie for this version.
+func (c *VersionedGraph) IsZombieEdge(chanID uint64) (bool, [33]byte,
+	[33]byte, error) {
+
+	return c.db.IsZombieEdge(c.v, chanID)
+}
+
 // AddrsForNode returns all known addresses for the target node public key.
 func (c *VersionedGraph) AddrsForNode(ctx context.Context,
 	nodePub *btcec.PublicKey) (bool, []net.Addr, error) {