[BUG]: Batch copy / memcpy tests hang Orin

### Is this a duplicate?

- [X] I confirmed there appear to be no [duplicate issues](https://github.com/NVIDIA/cccl/issues) for this bug and that I agree to the [Code of Conduct](CODE_OF_CONDUCT.md)

### Type of Bug

Runtime Error

### Component

CUB

### Describe the bug

Running `cub.cpp14.test.device_batch_memcpy` or `cub.cpp14.test.device_batch_copy` hangs Orin system or lead to sigkill.

### How to Reproduce

```bash
ninja cub.cpp14.test.device_batch_memcpy
/bin/cub.cpp14.test.device_batch_memcpy
```

### Expected behavior

We should avoid launching tests that can't fit into memory.

### Reproduction link

_No response_

### Operating System

_No response_

### nvidia-smi output

nvidia-smi is not supported on Orin

### NVCC version

_No response_