Rate limit improvements (#6315)

* We actually don't need to rate limit redundant requests.

Those redundant requests should not actually happen, but still.

* Add some logging.

* Also log message when the receiving side hit the rate limit.

* Update node/network/dispute-distribution/src/sender/mod.rs

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

Co-authored-by: eskimor <eskimor@no-such-url.com>
Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

polkadot/node/network/dispute-distribution/src/receiver/mod.rs

@@ -302,6 +302,12 @@ where
 
 		// Queue request:
 		if let Err((authority_id, req)) = self.peer_queues.push_req(authority_id, req) {
+			gum::debug!(
+				target: LOG_TARGET,
+				?authority_id,
+				?peer,
+				"Peer hit the rate limit - dropping message."
+			);
 			req.send_outgoing_response(OutgoingResponse {
 				result: Err(()),
 				reputation_changes: vec![COST_APPARENT_FLOOD],