Remove urltest outbound

adapter/experimental.go

@@ -25,3 +25,10 @@ type OutboundGroup interface {
 	Now() string
 	All() []string
 }
+
+func OutboundTag(detour Outbound) string {
+	if group, isGroup := detour.(OutboundGroup); isGroup {
+		return group.Now()
+	}
+	return detour.Tag()
+}