graph/db: impl FilterKnownChanIDs

Which lets us then run `TestFilterKnownChanIDsZombieRevival` and
`TestFilterKnownChanIDs` against our SQL backends.

graph/db/graph_test.go

@@ -2198,7 +2198,7 @@ func TestNodeUpdatesInHorizon(t *testing.T) {
 func TestFilterKnownChanIDsZombieRevival(t *testing.T) {
 	t.Parallel()
 
-	graph := MakeTestGraph(t)
+	graph := MakeTestGraphNew(t)
 
 	var (
 		scid1 = lnwire.ShortChannelID{BlockHeight: 1}
@@ -2264,7 +2264,7 @@ func TestFilterKnownChanIDs(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()
 
-	graph := MakeTestGraph(t)
+	graph := MakeTestGraphNew(t)
 
 	isZombieUpdate := func(updateTime1 time.Time,
 		updateTime2 time.Time) bool {