ref(iroh-net): Do not add the NodeId in the magicsock span field (#2679)

## Description

Since we have made MagicSock private it should always be created via the
Endpoint, unless we are internally messing around with tests or so.
Because of this we can make sure that the Endpoint always attaches the
correct "me" field to the span. Reducing the amount of noise in the
default log output.

## Breaking Changes

None

## Notes & open questions

Please do not merge before #2595 is merged. I'm trying to not add any
further changes to that PR.

## Change checklist

- [x] Self-review.
- ~~[ ] Documentation updates following the [style
guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text),
if relevant.~~
- ~~[ ] Tests if relevant.~~
- ~~[ ] All breaking changes documented.~~

iroh-net/src/magicsock.rs

@@ -1244,7 +1244,7 @@ impl MagicSock {
     }
 
     /// Triggers an address discovery. The provided why string is for debug logging only.
-    #[instrument(skip_all, fields(me = %self.me))]
+    #[instrument(skip_all)]
     fn re_stun(&self, why: &'static str) {
         debug!("re_stun: {}", why);
         inc!(MagicsockMetrics, re_stun_calls);
@@ -1371,8 +1371,8 @@ impl Handle {
             );
         }
 
-        Self::with_name(me.clone(), opts)
-            .instrument(error_span!("magicsock", %me))
+        Self::with_name(me, opts)
+            .instrument(error_span!("magicsock"))
             .await
     }