Description

Prevent the scheduled link checker from opening repeated Broken Links Report issues while an exact-title report is already open. The workflow paginates open issues, excludes pull requests, and creates a report only when no matching issue exists.

Checklist

• I have read the contributing guidelines

Was generative AI tooling used to co-author this PR?

• Yes (GitHub Copilot, powered by GPT-5.6 Sol)

Generated-by: GitHub Copilot following the guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run uv run poe all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Documentation Changes

N/A

• Run uv run poe doc locally to ensure the documentation pages renders correctly
• Check and fix any broken links (internal or external)

Expected Behavior

When a scheduled check finds broken links, it skips issue creation if an open issue titled Broken Links Report already exists. A matching pull request does not suppress report creation.

Steps to Test This Pull Request

1. Run the report script logic with an open issue titled Broken Links Report and confirm issue creation is skipped.
2. Run it with no matching issue, and with a matching pull request, and confirm a report issue is created.
3. Run uv run prek run check-yaml --files .github/workflows/links.yml.

Additional Context

The workflow create/skip branches were exercised with mocked GitHub API responses.

Fixes: #2071