CUDA 13: test cuML notebooks

[jameslamb]

Description

#782 added the first CUDA 13 builds here.

At that time, there weren't yet CUDA 13 XGBoost packages, and so some cuML notebooks failed to run.

We worked around that by just skipping cuML notebooks in CUDA 13 CI here:

#782 (comment)

Once there are XGBoost CUDA 13 packages and the rapids metapackage depends on them (tracked in rapidsai/integration#798), that testing should be restored here.

Benefits of this work

• improves release confidence

Acceptance Criteria

• cuML notebooks are testing in CUDA 13 CI here

Approach

Get rapids metapackage depending on CUDA 13 XGBoost packages:

• CUDA 13: Depend on CUDA builds of xgboost / rapids-xgboost for rapids packages integration#798

Then revert the workarounds for cuML notebooks added in #782

Notes

N/A