fix(vllm-tests): skip omni test collection when vllm_omni is missing

[krishung5]

Summary

• The sample-runtime / Unified Test cuda12.9, amd64 CI job (.github/workflows/pr.yaml:479) has been failing on every PR that touches lib/** or other paths that trigger changed-files.outputs.core. The job runs pytest -m "pre_merge and gpu_0 and unified" on a CPU-only runner with no test-path filter, so pytest walks the whole repo and imports every test_*.py it finds before filtering by marker.
• components/src/dynamo/vllm/tests/omni/test_*.py files transitively import vllm_omni at module-load time. vllm_omni isn't installed in the sample-runtime image (and on CPU-only platforms the import can raise something other than ImportError), so the per-file try/except ImportError: pytest.skip(...) guard inside each test file doesn't always catch it.
• The repo already has a pytest_ignore_collect guard in components/src/dynamo/vllm/tests/conftest.py that skips test_vllm_*.py files when vllm isn't importable. This PR extends that same hook to also skip any file under an omni/ directory when vllm_omni isn't importable.

Test plan

• CI sample-runtime / Unified Test cuda12.9, amd64 job passes on this PR (it has been failing on PRs that touch core-changed files)
• No change in behavior on runners that DO have vllm_omni installed — omni tests still get collected and run

🤖 Generated with Claude Code

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Summary by CodeRabbit

• Tests
  • Improved test collection logic to conditionally skip optional component tests when required dependencies are unavailable.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between e2f63d0 and 43c87a5.

📒 Files selected for processing (1)

• components/src/dynamo/vllm/tests/conftest.py

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Walkthrough

The pytest_ignore_collect hook in the test configuration now skips omni test files when the vllm_omni module is unavailable, extending the existing pattern used for test_vllm_* files.

Changes

Test Collection Skip Logic

Layer / File(s)	Summary
Omni Test Skip Condition components/src/dynamo/vllm/tests/conftest.py	pytest_ignore_collect adds a conditional branch that skips files containing an omni path segment and starting with test_ when vllm_omni import fails.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: extending the test collection skip logic to handle omni tests when vllm_omni is missing.
Description check	✅ Passed	The description provides comprehensive context including the problem statement, existing behavior, the proposed solution, and a clear test plan, covering all required template sections.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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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[krishung5]

Folded into #9407 — single PR is easier to land since both fixes are needed for main to build + sample-runtime to pass.