chore: match the error strings in cost errors

Author: kantai

clarity/src/vm/costs/mod.rs

@@ -217,8 +217,7 @@ impl DefaultVersion {
             };
 
             CostErrors::CostComputationFailed(format!(
-                "Error evaluating result of cost function {}: {e}",
-                &cost_function_ref.function_name
+                "Error evaluating result of cost function {cost_function_ref}: {e}",
             ))
         })
     }

stackslib/src/clarity_vm/tests/costs.rs

@@ -892,7 +892,12 @@ fn eval_cost_fn(
         .eval_read_only(&boot_costs_id, &exec)
         .map(|(value, _, _)| Some(value));
 
-    parse_cost(cost_fn_name, exec_result)
+    let clarity_cost_fn_ref = ClarityCostFunctionReference {
+        contract_id: boot_costs_id,
+        function_name: cost_fn_name.to_string(),
+    };
+
+    parse_cost(&clarity_cost_fn_ref.to_string(), exec_result)
 }
 
 fn eval_replaced_cost_fn(