DWIPreproc references non-existing inputs

[GalKepler]

Summary

In the _list_outputs method of mrtrix's DWIPreproc (in nipype.interfaces.mrtrix3.preprocess).

Actual behavior

Raises an error due to referencing export_grad_mrtrix and export_grad_fsl, while the actual inputs are export_grad_mrtrix and out_grad_fsl.

How to replicate the behavior

Simply execute DWIPreproc with any given inputs.

Platform details:

{'commit_hash': '57c9932',
 'commit_source': 'repository',
 'networkx_version': '3.3',
 'nibabel_version': '5.2.1',
 'nipype_version': '1.8.6',
 'numpy_version': '1.26.4',
 'pkg_path': '/home/galkepler/Projects/yalab-devops/yalab-procedures/.venv/lib/python3.11/site-packages/nipype',
 'scipy_version': '1.14.0',
 'sys_executable': '/home/galkepler/Projects/yalab-devops/yalab-procedures/.venv/bin/python',
 'sys_platform': 'linux',
 'sys_version': '3.11.8 | packaged by conda-forge | (main, Feb 16 2024, '
                '20:53:32) [GCC 12.3.0]',
 'traits_version': '6.3.2'}

Execution environment

• My python environment outside container

[GalKepler]

Found out that I've already fixed this issue before at #3596, but for some reason my fix isn't included in the PyPi package...

[effigies]

I think we need to release