Signed extension for rejecting obsolete messages pallet transactions (#1446)

* BridgeRejectObsoleteMessages

* add obsolete confirmations verification to the BridgeRejectObsoleteMessages

* move tests where they belong

bridges/relays/messages/src/message_lane_loop.rs

@@ -729,6 +729,7 @@ pub(crate) mod tests {
 					unrewarded_relayer_entries: 0,
 					messages_in_oldest_entry: 0,
 					total_messages: 0,
+					last_delivered_nonce: 0,
 				},
 			))
 		}