feat: Add LS startup indicator

See merge request !3187

Merged-by: Tristan Read <tread@gitlab.com>
Approved-by: Uma Chandran <uchandran@gitlab.com>
Approved-by: Tristan Read <tread@gitlab.com>
Reviewed-by: Olena Horal-Koretska <ohoralkoretska@gitlab.com>
Reviewed-by: Uma Chandran <uchandran@gitlab.com>
Co-authored-by: Olena Horal-Koretska <ohoralkoretska@gitlab.com>

# **pre-release**  [6.78.0](gitlab-org/gitlab-vscode-extension@v6.77.0...v6.78.0) (2026-05-11)
### ✨ Features

* Add LS startup indicator ([18f6595c](gitlab-org/gitlab-vscode-extension@18f6595c)) by Olena Horal-Koretska