MR: Pending ## Description As a workspaces user, I want to set up the VSCode's Settings Sync client to use GitLab's Settings Sync REST API so that I can use this feature to persist my settings across workspaces. ## Acceptance Criteria - [ ] The VSCode server injected into Workspaces has a custom `product.json` file that contains a `configurationStore.sync` object that points to the GitLab instance's Settings Sync API endpoints.