[VL] Looks CelebornShuffleReader doesn't spill data

### Backend

VL (Velox)

### Bug description

```c++
25/05/28 17:12:50 ERROR [Executor task launch worker for task 0.0 in stage 399.0 (TID 76139)] ManagedReservationListener: Error reserving memory from target
org.apache.gluten.memory.memtarget.ThrowOnOomMemoryTarget$OutOfMemoryException: Not enough spark off-heap execution memory. Acquired: 8.0 MiB, granted: 6.0 MiB. Try tweaking config option spark.memory.offHeap.size to get larger space to run this application (if spark.gluten.memory.dynamic.offHeap.sizing.enabled is not enabled).
Current config settings:
spark.gluten.memory.offHeap.size.in.bytes=5.6 GiB
spark.gluten.memory.task.offHeap.size.in.bytes=1433.5 MiB
spark.gluten.memory.conservative.task.offHeap.size.in.bytes=716.8 MiB
spark.memory.offHeap.enabled=true
spark.gluten.memory.dynamic.offHeap.sizing.enabled=false
Memory consumer stats:
Task.76139: Current used bytes: 5.6 GiB, peak bytes: N/A
+- Gluten.Tree.5: Current used bytes: 5.5 GiB, peak bytes: 5.5 GiB
| \- Capacity[8.0 EiB].5: Current used bytes: 5.5 GiB, peak bytes: 5.5 GiB
| +- CelebornShuffleReader.5: Current used bytes: 5.5 GiB, peak bytes: 5.5 GiB
| | \- single: Current used bytes: 5.5 GiB, peak bytes: 5.5 GiB
| | +- root: Current used bytes: 5.5 GiB, peak bytes: 5.5 GiB
| | | \- default_leaf: Current used bytes: 5.5 GiB, peak bytes: 5.5 GiB
| | \- gluten::MemoryAllocator: Current used bytes: 0.0 B, peak bytes: 0.0 B
| +- ArrowContextInstance.5: Current used bytes: 8.0 MiB, peak bytes: 8.0 MiB
| +- ColumnarToRow.0.OverAcquire.0: Current used bytes: 0.0 B, peak bytes: 2.4 MiB
| +- ColumnarToRow.0: Current used bytes: 0.0 B, peak bytes: 8.0 MiB
| | \- single: Current used bytes: 0.0 B, peak bytes: 8.0 MiB
| | +- root: Current used bytes: 0.0 B, peak bytes: 7.0 MiB
| | | \- default_leaf: Current used bytes: 0.0 B, peak bytes: 7.0 MiB
| | \- gluten::MemoryAllocator: Current used bytes: 0.0 B, peak bytes: 0.0 B
| \- CelebornShuffleReader.5.OverAcquire.0: Current used bytes: 0.0 B, peak bytes: 1288.8 MiB
\- org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter@4d16a67d: Current used bytes: 136.0 MiB, peak bytes: N/A
```

### Gluten version

Gluten-1.3

### Spark version

Spark-3.2.x

### Spark configurations

_No response_

### System information

_No response_

### Relevant logs

```bash

```

Start at the CelebornShuffleReader entry point and compare its memory-consumer statistics with the reported OutOfMemoryException. Reproduce the Spark 3.2.x, Gluten 1.3 scenario using the listed off-heap settings, then verify whether shuffle data spills and document or fix the behavior indicated by the memory usage.

Written by the indexing model from the issue text.