Remove test console warnings and add CI enforcement

[Copilot]

Test output contained React act() and console warnings that could regress silently. This PR cleans up the current warning sources and adds CI-only enforcement for unexpected console.* calls.

Changelog

New

• Added CI-only Vitest console enforcement via vitest-fail-on-console.

Changed

• Updated warning-producing tests to wait for async React updates more explicitly.
• Adjusted components/tests that leaked invalid DOM props or React warnings.
• Preserved expected warning/error cases with explicit allowlisted handling.

Removed

• Removed unintended DOM attributes from rendered output where they caused React warnings.

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Test-only and test-infrastructure hardening; no public API rollout needed.

Testing & Reviewing

Review focus:

• script/vitest/setup.ts console enforcement behavior
• Tests that now explicitly handle async state updates
• Components touched to avoid React console output

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]

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Latest commit: 6231ef5

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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.