Add getTasksWithRetry with retry logic for transient network errors

[HuyPhanNguyen]

Background

Network timeouts and transient HTTP errors (502, 504) caused "Unknown task Id" failures instead of retrying. Promise.allSettled() swallowed errors and returned empty arrays.

Change

• Changed Promise.allSettled() to Promise.all() to propagate errors
• Added retry logic with exponential backoff (5s → 10s → 20s)
• Retries on HTTP 429/502/503/504 and network errors (ETIMEDOUT, ECONNRESET, etc.)
• Added validation to handle null/undefined tasks in API responses
• Configurable via ServerTaskWaiterOptions: maxRetries (default: 3), retryBackoffMs (default: 5000)

[sc-124345]

[hnrkndrssn]

As per my inline comment