Add missing event in PendingComponent span and clean up sync logs (#8033)

I was looking into some long `PendingComponents` span and noticed the block event wasn't added to the span, so it wasn't possible to see when the block was added from the trace view, this PR fixes this.

<img width="637" height="430" alt="image" src="https://github.com/user-attachments/assets/65040b1c-11e7-43ac-951b-bdfb34b665fb" />

Additionally I've noticed a lot of noises and confusion in sync logs due to the initial`peer_id` being included as part of the syncing chain span, causing all logs under the span to have that `peer_id`, which may not be accurate for some sync logs, I've removed `peer_id` from the `SyncingChain` span, and also cleaned up a bunch of spans to use `%` (display) for slots and epochs to make logs easier to read.


  


Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

beacon_node/store/src/state_cache.rs

@@ -299,7 +299,7 @@ impl<E: EthSpec> StateCache<E> {
         None
     }
 
-    #[instrument(skip(self), level = "debug")]
+    #[instrument(skip_all, fields(?block_root, %slot), level = "debug")]
     pub fn get_by_block_root(
         &mut self,
         block_root: Hash256,