node: Always try to relay node announcements

They are cached and will often be old. They should still be relayed.

radicle-node/src/service.rs

@@ -1338,11 +1338,14 @@ where
         let now = self.clock;
         let timestamp = message.timestamp();
         // To avoid spamming peers on startup with historical gossip messages,
-        // don't relay messages that are too old.
-        let relay = if now - timestamp.to_local_time() > MAX_TIME_DELTA {
-            false
-        } else {
+        // don't relay messages that are too old. We make an exception for node announcements,
+        // since they are cached, and will hence often carry old timestamps.
+        let relay = if message.is_node_announcement()
+            || now - timestamp.to_local_time() <= MAX_TIME_DELTA
+        {
             self.config.relay
+        } else {
+            false
         };
 
         // Don't allow messages from too far in the future.

radicle-node/src/service/message.rs

@@ -274,6 +274,10 @@ impl AnnouncementMessage {
             Self::Node(NodeAnnouncement { timestamp, .. }) => *timestamp,
         }
     }
+
+    pub fn is_node_announcement(&self) -> bool {
+        matches!(self, Self::Node(_))
+    }
 }
 
 impl From<NodeAnnouncement> for AnnouncementMessage {