Add devcontainer fallback for C++ test location

[jameslamb]

Proposes some small updates to match existing RAPIDS conventions for ci/run_* scripts.

• adds another directory search in run_ctests.sh, for use in devcontainer environment (similar to Add devcontainer fallback for C++ test location NVIDIA/cuml#7596)
• ensures that run_nvforest_pytests.sh can be called from other paths besides the root of the repo

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 1962ef9 and 0ff197b.

📒 Files selected for processing (2)

• ci/run_ctests.sh
• ci/run_nvforest_pytests.sh

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📝 Summary

Summary by CodeRabbit

• Bug Fixes

  • Improved test execution scripts to locate tests in configured installations or development builds, with clear errors when tests are unavailable.
  • Test scripts can now be run from outside their own directory without path-related failures.

• Maintenance

  • Updated copyright information in the test runner.

Walkthrough

The CI scripts now locate CTest files through ordered path checks and fail clearly when no location exists. The pytest script now normalizes its working directory to the repository root before execution.

Changes

CI path handling

Layer / File(s)	Summary
CTest location discovery ci/run_ctests.sh	The script checks the configured or Conda-installed test path first, then the devcontainer build path. It reports both paths and exits with an error when neither path exists.
Pytest repository normalization ci/run_nvforest_pytests.sh	The script changes to the repository root based on its resolved location before running pytest. The SPDX copyright range now covers 2025–2026.

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

Merge Risk: ⚪ Minimal · up to 0ff19

CTest execution can now fall back to the devcontainer test location, and pytest invocation works outside the repository root. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
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.
Description check	✅ Passed	The description directly explains the devcontainer fallback and repository-root normalization changes.
Title check	✅ Passed	The title clearly identifies the primary change: adding a devcontainer fallback for the C++ test location.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[jameslamb]

I've retargeted this at 26.10. I would really like to get it in if possible (allows us to drop a patch in DLFW builds).

[jameslamb]

/merge