MR: Pending ## Description As a workspaces user, I want to expose the workspace's GitLab Authentication token to VSCode so that I can use it to persist my settings using the Settings Sync feature. ## Acceptance Criteria - [ ] The AuthenticationProvider provides a single user session which cannot be removed. - [ ] The AuthenticationProvider doesn't allow creating another user session. - [ ] The AuthenticationProvider exposes the GitLab's user name in the VSCode user sessions UI