📝 Documentation: Add missing vitest rules to rule-data

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Overview

Renovate PR #3285 updates a dependency whose vitest rules no longer match packages/rule-data/src/data.json.
packages/rule-data/src/data.test.ts fails on that PR until the data is synced.

Missing from data.json (3):

• vitest/prefer-mock-return-shorthand
• vitest/require-test-timeout
• vitest/unbound-method

Additional Info

Filed by the Rule Data Renovate workflow.
This issue is updated in place while Renovate PRs keep reporting vitest gaps, so the lists above reflect the latest failing run.

To resolve:

1. Add each missing rule to packages/rule-data/src/data.json, and remove stale references.
2. For rules that shouldn't be skipped, file a new rule issue to track the Flint equivalent.
3. Run pnpm --filter=rule-data sort-data.
4. Push to the Renovate branch, or open a PR that bumps the dependency and closes this issue.