Add cleanup hook helpers

[jamilahmadzai]

Fixes #928

Summary

• Add test.cleanup() and test.cleanupEach() as paired setup and guaranteed-cleanup hooks.
• Add serial and .skip() variants while preserving conditional-chain access.
• Register the helpers through the existing AVA hook machinery, so no runner-specific task type is needed.
• Clone declaration arguments for each paired registration because argument parsing consumes its input array.
• Document the public API and cover metadata, runtime order, failure paths, skipped pairs, and TypeScript declarations.
• Refresh the Node 26 TAP edge-case snapshot for Node 26.5.0 internal line-number output.

Validation

Run locally:

• Node.js 24.12: npx test-ava test/create-chain/test.js - 25 passed
• Node.js 24.12: npx tap test-tap/hooks.js - 32 passed
• Node.js 26.5.0: npx tap test-tap/reporters/tap.js - 5 passed
• npx tsc --noEmit - passed
• npx xo - passed (10 existing TODO/FIXME warnings)

A complete npm test run passed lint, TypeScript, and all 217 core tests (2 skipped). The broader TAP run passed 1,625/1,628 assertions; the only three failures were existing Node 24 default-reporter snapshot mismatches, reproduced unchanged on upstream/main.

Bounty

IssueHunt funded amount: $82. Payout GitHub user: @jamilahmadzai.

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IssueHunt Summary

Referenced issues

This pull request has been submitted to:

• #928: Make it easier to write reliable cleanup tasks

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