is Retriable
Returns whether the Instant client will automatically retry syncing after this error.
When this returns true, the error is transient (e.g., a network timeout or HTTP 502 Bad Gateway) and the SDK will automatically retry the sync with exponential backoff. You may want to log these errors rather than showing user-facing alerts.
When this returns false, the error is not automatically retried and may require action such as reauthenticating, clearing local storage, or updating the app.
Return
true if the SDK will automatically retry syncing, false otherwise.