Remove support for VS Code(fork) 1.81

Issue: Rails: Remove support for VS Code(fork) 1.81 (#440293 - closed)

What does this MR do and why?

Remove remaining usages of VS Code(fork) 1.81 and associated test/fixtures.

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.

Steps:

1. Update .dev.yaml of project such that components.attributes.gl/use-vscode-1-81 is true.
2. Create a workspace
3. Open the workspace URL and run "${GL_TOOLS_DIR}/code-server/bin/gitlab-webide-server" --version
4. Version used is 1.85.2

Screenshot: