fix(deps): add cufile to test dependencies for cuda12

[gforsyth]

Description

Testing a smaller base CI image for wheel tests in #1548 -- that image does not
have cuda toolkit installed and we rely on installing all dependencies from
wheels.

In rapidsai/kvikio#1000 and rapidsai/kvikio#1003 we added handling for loading
cufile from an installed wheel -- but we add that dependency to libkvikio
wheels as cuda-toolkit[cufile] and there was no cufile extra available
before cuda-toolkit==12.6.3, so for the testing setup here, we explicitly
install nvidia-cufile-cu12 for earlier versions of cuda-toolkit so that
libcufile is available for tests.

(cuOpt doesn't have a direct dependency on cufile, but instead is running into this in libkvikio via pylibcudf.)

xref rapidsai/build-planning#143

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

[github-actions]

CI Test Summary

✅ All 31 test job(s) passed.

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📥 Commits

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📒 Files selected for processing (1)

• dependencies.yaml

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• dependencies.yaml

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📝 Walkthrough

Walkthrough

Changes

cuFile dependency integration

Layer / File(s)	Summary
Configure cuFile test dependency dependencies.yaml	Adds the test_cufile group for conditional nvidia-cufile-cu12 installation and includes it in the py_test_cuopt environment.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding cufile test dependencies for CUDA 12.
Description check	✅ Passed	The description matches the change and explains why the new cufile wheel dependency is needed for tests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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