test: handle expected console output

[joshblack]

Closes: N/A

Updates tests that intentionally trigger React warnings or errors so the expected console output is explicitly mocked. This keeps the original assertions while making those tests compatible with console-failure enforcement.

Changelog

New

• N/A

Changed

• Tests now use shared helpers for expected console errors and warnings.

Removed

• N/A

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; test-only changes.

Testing & Reviewing

Validated as part of the final stack with build, tests, type-check, lint, CSS lint, and format checks.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 24c767b

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[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.

To publish a canary release for integration testing, apply the Canary Release label to this PR.