[BUG]: cudax should not depend on own nvtx helpers

### 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

Compile-time Error

### Component

Not sure

### Describe the bug

When merging CUDASTF we also pulled in their own nvtx helper

We need to consolidate with our cub NVTX work by @bernhardmgruber to ensure we do not run into the same problems we did before.

### How to Reproduce

building cudax

### Expected behavior

We should not openly inlcude nvtx headers

### Reproduction link

_No response_

### Operating System

_No response_

### nvidia-smi output

_No response_

### NVCC version

_No response_