[Feature]: Add `throwIfError` method for map and parallel result

### What would you like?

I'd like to have a `throwIfError` method equivalent for Map and Parallel like other SDKs:
* js: https://github.com/aws/aws-durable-execution-sdk-js/blob/main/packages/aws-durable-execution-sdk-js/src/handlers/concurrent-execution-handler/batch-result.ts#L169
* py: https://github.com/aws/aws-durable-execution-sdk-python/blob/main/packages/aws-durable-execution-sdk-python/src/aws_durable_execution_sdk_python/concurrency/models.py#L382

### Possible Implementation

See https://github.com/aws/aws-durable-execution-sdk-java/issues/573#issuecomment-5233696422

### Is this a breaking change?

No

### Does this require an RFC?

No

### Additional Context

_No response_