Mark L1 tests as disabled

[mlubin]

We don't run these tests, and agents sometimes forget the -E L1TEST instructions. Let's mark them as disabled.

[copy-pr-bot]

This pull request requires additional validation before any workflows can run on NVIDIA's runners.

Pull request vetters can view their responsibilities here.

Contributors can view more details about this message here.

[mlubin]

/ok to test 561a496

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 793e35f1-c7df-4d98-b687-68d1779cbd4d

📥 Commits

Reviewing files that changed from the base of the PR and between 561a496 and 592b77a.

📒 Files selected for processing (2)

• CONTRIBUTING.md
• cpp/tests/routing/CMakeLists.txt

🚧 Files skipped from review as they are similar to previous changes (1)

• cpp/tests/routing/CMakeLists.txt

---

📝 Walkthrough

Walkthrough

Documentation updated to remove the L1-test exclusion from the ctest command; CMake test configuration now marks two L1 test targets as disabled so they won't run in standard CTest executions.

Changes

Cohort / File(s)	Summary
Documentation CONTRIBUTING.md	Replaced the previous ctest ... -E L1TEST exclusion with ctest --test-dir ${CUOPT_HOME}/cpp/build and removed the sentence explaining that L1 tests are excluded because they are expensive and not run during typical development.
Test Configuration cpp/tests/routing/CMakeLists.txt	Added set_tests_properties(...) to set DISABLED TRUE for RETAIL_L1TEST and ROUTING_L1TEST, preventing those tests from running in standard CTest runs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: marking L1 tests as disabled, which matches the core objective of the pull request.
Description check	✅ Passed	The description is directly related to the changeset, explaining the rationale for marking L1 tests as disabled and why this change is needed.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[mlubin]

/ok to test 592b77a

[ramakrishnap-nv]

/ok to test 4def18a

[ramakrishnap-nv]

/merge