Release v0.27.0-preview.6

What's Changed

• fix(patch): cherry-pick 2905503 to release/v0.27.0-preview.5-pr-18215 to patch version v0.27.0-preview.5 and create version 0.27.0-preview.6 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/18217

Full Changelog: https://github.com/google-gemini/gemini-cli/compare/v0.27.0-preview.5...v0.27.0-preview.6