chore: print validator when listing checkpoint indices (#4550)

### Description

Minor addition to make it easy to figure out which validator is behind
(from the multisig consts mapping)

typescript/infra/scripts/list-validator-checkpoint-indices.ts

@@ -39,11 +39,12 @@ async function main() {
         chain,
         identifier,
         index,
+        validator,
       };
     },
   );
 
-  console.table(indices, ['chain', 'index', 'identifier']);
+  console.table(indices, ['chain', 'index', 'identifier', 'validator']);
 }
 
 main().catch(console.error);