v2.8.18-canary.8

<!-- Release notes generated using configuration in .github/release.yml at v2.8.18-canary.8 -->

What's Changed

Changelog

• chore: Remove deprecated Spaces feature remnants by @anthonyshew in https://github.com/vercel/turborepo/pull/12316
• refactor: Route run/watch output through unified TerminalSink by @anthonyshew in https://github.com/vercel/turborepo/pull/12315

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.18-canary.7...v2.8.18-canary.8