chore: change NodeIdentity debug (#3817)

Description
---
Remove secret_key from debug print for `NodeIdentity`. The display is using the same fields that are used in the `fmt::Display` trait

comms/src/peer_manager/node_identity.rs

@@ -41,7 +41,7 @@ use crate::{
 };
 
 /// The public and private identity of this node on the network
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Serialize, Deserialize)]
 pub struct NodeIdentity {
     #[serde(serialize_with = "serialize_to_hex")]
     #[serde(deserialize_with = "deserialize_node_id_from_hex")]
@@ -221,3 +221,16 @@ impl fmt::Display for NodeIdentity {
         Ok(())
     }
 }
+
+impl fmt::Debug for NodeIdentity {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("NodeIdentity")
+            .field("public_key", &self.public_key)
+            .field("node_id", &self.node_id)
+            .field("public_address", &self.public_address)
+            .field("features", &self.features)
+            .field("secret_key", &"<secret>")
+            .field("identity_signature", &*acquire_read_lock!(self.identity_signature))
+            .finish()
+    }
+}