[🚀 Request] Support testing of web-based VS Code instances (code-server)

[jiridanek]

Describe the request

Ability to run tests in brower-based VS Code.

I found an existing ticket about this, which seems to be not-yet resolved

• [🚀 Request] Clarify support for VSCode in a browser #757

Usage

In https://opendatahub.io/, we are building Workbenches based on web-based VS Code (https://github.com/coder/code-server). We would like to use a library that implements VS Code UI elements for easier writing of tests.