Temporarily Include Web UI in the VS Code Server and editor injector

We decided that in the first iteration, we'll package the VS Code Web UI together with the VS Code server to have a fully-functioning editing experience even before we connect the WebIDE with the VS Code server.

The reasoning is in this conversation: #391856 (comment 1286564179)

Builds on top of #392856 (closed)

Merge requests

• gitlab-org/remote-development/gitlab-remote-development-docs!16 (merged)
• gitlab-web-ide-vscode-fork!39 (merged)