CometIcebergNativeScanExec: propagate outputOrdering from originalPlan instead of hardcoding Nil

### What is the problem the feature request solves?

CometIcebergNativeScanExec.scala hardcodes outputOrdering to Nil:

```
override lazy val outputOrdering: Seq[SortOrder] = Nil
```

Ref https://github.com/apache/iceberg/issues/16430

We can update it to :

```
override lazy val outputOrdering: Seq[SortOrder] =
if (originalPlan != null) originalPlan.outputOrdering else Nil
```

originalPlan is the wrapped BatchScanExec. Once Iceberg implements SupportsReportOrdering, BatchScanExec.outputOrdering returns the correct sort order and Comet inherits it

This wil eliminate CometSortExec above Iceberg native scans for sort-merge joins .

### Describe the potential solution

_No response_

### Additional context

_No response_