feat: show branches and improve layout in MR overview webview

Closes #2270

See merge request gitlab-org/gitlab-vscode-extension!3176

Merged-by: Juhee Lee <julee@gitlab.com>
Approved-by: Peter Hegman <phegman@gitlab.com>
Approved-by: Juhee Lee <julee@gitlab.com>
Reviewed-by: Peter Hegman <phegman@gitlab.com>
Co-authored-by: Mohammed Osumah <mosumah@gitlab.com>

feat: Add LS startup telemetry

Closes #2269

See merge request !3193

Merged-by: Juhee Lee <julee@gitlab.com>
Approved-by: Juhee Lee <julee@gitlab.com>
Co-authored-by: Olena Horal-Koretska <ohoralkoretska@gitlab.com>

# **pre-release**  [6.79.0](v6.78.1...v6.79.0) (2026-05-12)
### ✨ Features

* Add LS startup telemetry ([3fd178b9](3fd178b9)) by Olena Horal-Koretska
* show branches and improve layout in MR overview webview ([2b763800](2b763800)) by Mohammed Osumah