Fix ExponentialBackoff maxElapsed timeout bypass in execute()

The execute() method tracked elapsedMs across retries but never
checked it against maxElapsed, allowing the retry loop to continue
indefinitely regardless of the configured time limit.

Author: deepshekhardas

packages/core/src/v3/apps/backoff.ts

@@ -340,6 +340,10 @@ export class ExponentialBackoff {
         elapsedMs += Date.now() - start;
         clearTimeout(attemptTimeout);
       }
+
+      if (elapsedMs > this.#maxElapsed * 1000) {
+        break;
+      }
     }
 
     if (finalError instanceof AttemptTimeout) {