Release v0.12.0-preview.8

What's Changed

• fix(patch): cherry-pick 11e1e98 to release/v0.12.0-preview.7-pr-12347 to patch version v0.12.0-preview.7 and create version 0.12.0-preview.8 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/12383

Full Changelog: https://github.com/google-gemini/gemini-cli/compare/v0.12.0-preview.7...v0.12.0-preview.8