[VL] Fix iceberg `numWrittenFiles` metric

### Backend

VL (Velox)

### Bug description

```
- iceberg write metrics *** FAILED ***
0 did not equal 1 (VeloxIcebergSuite.scala:325)
07:49:59.509 WARN org.apache.gluten.execution.enhanced.VeloxIcebergSuite:

```
numWrittenFiles is not updated due to below commits
https://github.com/facebookincubator/velox/commit/a38ed08cb134be358b0e892ca2862d16a3ab1c75

for iceberg write we need to cope with the new API to update the stats

### Gluten version

_No response_

### Spark version

None

### Spark configurations

_No response_

### System information

_No response_

### Relevant logs

```bash

```