[testnet] Log gRPC status as Debug, not Display. (#4760)

Backport of #4761.

## Motivation

The `Display` impl of `Status` omits the source.

## Proposal

Use `Debug` instead.

## Test Plan

This should help with debugging some of the gRPC issues we are seeing on
the testnet.

## Release Plan

- These changes should be released in a new SDK.

## Links

- PR to main: #4761
- [reviewer
checklist](https://github.com/linera-io/linera-protocol/blob/main/CONTRIBUTING.md#reviewer-checklist)

Author: afck

linera-core/src/node.rs

@@ -284,7 +284,7 @@ pub enum NodeError {
     CannotResolveValidatorAddress { address: String },
     #[error("Subscription error due to incorrect transport. Was expecting gRPC, instead found: {transport}")]
     SubscriptionError { transport: String },
-    #[error("Failed to subscribe; tonic status: {status}")]
+    #[error("Failed to subscribe; tonic status: {status:?}")]
     SubscriptionFailed { status: String },
 
     #[error("Node failed to provide a 'last used by' certificate for the blob")]

linera-indexer/lib/src/grpc/mod.rs

@@ -95,7 +95,7 @@ where
                                 Err(error) => {
                                     // If there was an error, return it
                                     let status = Status::from(error);
-                                    error!("Error processing element: {}", status);
+                                    error!("Error processing element: {status:?}");
                                     return Some((
                                         Err(status),
                                         (input_stream, database, pending_blobs),

linera-rpc/src/cross_chain_message_queue.rs

@@ -60,7 +60,7 @@ pub(crate) async fn forward_cross_chain_queries<F, G>(
                     if let Err(error) = run_task(state.task).await {
                         warn!(
                             nickname = state.nickname,
-                            %error,
+                            ?error,
                             retry = state.retries,
                             from_shard = this_shard,
                             to_shard,

linera-rpc/src/grpc/client.rs

@@ -71,11 +71,11 @@ impl GrpcClient {
     fn is_retryable(status: &Status) -> bool {
         match status.code() {
             Code::DeadlineExceeded | Code::Aborted | Code::Unavailable | Code::Unknown => {
-                info!("gRPC request interrupted: {}; retrying", status);
+                info!("gRPC request interrupted: {status:?}; retrying");
                 true
             }
             Code::Ok | Code::Cancelled | Code::ResourceExhausted => {
-                info!("Unexpected gRPC status: {}; retrying", status);
+                info!("Unexpected gRPC status: {status:?}; retrying");
                 true
             }
             Code::NotFound => false, // This code is used if e.g. the validator is missing blobs.
@@ -88,7 +88,7 @@ impl GrpcClient {
             | Code::Internal
             | Code::DataLoss
             | Code::Unauthenticated => {
-                info!("Unexpected gRPC status: {}", status);
+                info!("Unexpected gRPC status: {status:?}");
                 false
             }
         }