Stop printing ChainWorkerRequest (#3618)

## Motivation

The `ChainWorkerRequest` is huge, we shouldn't print it. Saw it on the logs, and was taking over them completely.

## Proposal

Stop logging the contents of `ChainWorkerRequest`.

## Test Plan

CI + don't see it in logs anymore

## Release Plan

- Nothing to do / These changes follow the usual release cycle.

Author: ndr-ds

linera-core/src/chain_worker/actor.rs

@@ -309,7 +309,7 @@ where
     }
 
     /// Runs the worker until there are no more incoming requests.
-    #[instrument(skip(self))]
+    #[instrument(skip(self, request))]
     pub async fn handle_request(&mut self, request: ChainWorkerRequest<StorageClient::Context>) {
         // TODO(#2237): Spawn concurrent tasks for read-only operations
         let responded = match request {