Update VSCode fork with new default theme and window indicator

What does this MR do and why?

It updates the VSCode Fork to release https://gitlab.com/gitlab-org/gitlab-web-ide-vscode-fork/-/releases/1.89.1-1.0.0-dev-20241119100914. This release applies contains the following improvements for Workspaces:

  1. Applies GitLab VSCode theme.
  2. Displays GitLab logo and "GitLab Workspaces" in window indicator.
  3. Hides "VSCode for the Web" walkthrough that used to appear the first time a user opens a Workspace.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Loading a Workspace with the default theme, a customized window indicator, and without the VSCode for the Web walkthrough.

workspace_with_dark_theme_updated.mov

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Edited by Enrique Alcántara

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