chore: expose actual debug_traceCall error

Without this it was being hidden, somehow.

protocol-testing/src/rpc.rs

@@ -130,6 +130,10 @@ impl RPCProvider {
             .client()
             .request("debug_traceCall", (transaction, BlockId::from(block_number), trace_options))
             .await
+            .map_err(|e| {
+                tracing::error!("debug_traceCall RPC error: {:#}", e);
+                e
+            })
             .into_diagnostic()
             .wrap_err("Failed to debug trace call many")?;