fix: skip backoff sleep after the final retryAndBackoff attempt (#1937)

Signed-off-by: Zhiwei Liang <zhiwei.liang@zliang.me>
Co-authored-by: Joseph Klix <jkl@amazon.com>

src/helpers.ts

@@ -260,13 +260,13 @@ export async function retryAndBackoff<T>(
         `Retrying after ${Math.floor(delay)}ms.`,
     );
 
-    await sleep(delay);
-
     if (nextRetry >= maxRetries) {
       core.info(`Retry${opName}: reached max retries (${maxRetries}); giving up.`);
       throw err;
     }
 
+    await sleep(delay);
+
     return await retryAndBackoff(fn, isRetryable, maxRetries, nextRetry, base, label);
   }
 }