Temporarily exclude GB300 from testing

[KyleFromNVIDIA]

Description

Temporarily exclude GB300 until we resolve outstanding test failures.

Issue

#1647

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

[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: Enterprise

Run ID: c4cb2acd-811a-4055-8293-063b3b80c06c

📥 Commits

Reviewing files that changed from the base of the PR and between 2842c1b and f36090f.

📒 Files selected for processing (2)

• .github/workflows/pr.yaml
• .github/workflows/test.yaml

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📝 Walkthrough

Walkthrough

The pull request updates both workflow test matrices to exclude configurations using the gb300 GPU.

Changes

GPU test matrix filtering

Layer / File(s)	Summary
Exclude GB300 configurations .github/workflows/pr.yaml, .github/workflows/test.yaml	The conda-python-tests matrices skip configurations whose GPU is gb300.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: jameslamb, ramakrishnap-nv, gforsyth

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: temporarily excluding GB300 from testing.
Description check	✅ Passed	The description explains the GB300 test exclusion, its temporary purpose, and the related issue.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[KyleFromNVIDIA]

/merge

[github-actions]

CI Test Summary

✅ All 31 test job(s) passed.