Upgrade @gitlab/web-ide package

What does this MR do and why?

• Upgrade to latest @gitlab/web-ide package which contains changes on how we bundle vscode/node_modules.
• Add a spec to ensure that vscode/node_modules directory exists when @gitlab/web-ide package is installed.

References

Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

• This MR is a follow up to: refactor: handle packaged node_modules (gitlab-web-ide!400 - merged)

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

web-ide-testing

How to set up and validate locally

• Pull this branch locally and run yarn install
• Ensure that the Web IDE works as expected!