Implement editor injector for WebIDE VS Code server

The goal is to inject our VS Code server (packages, docs) into the workspace as an editor.

• VS Code injector from Eclipse https://github.com/che-incubator/che-code

Success Criteria

• Docker image of gitlab-vscode-reh injector
• Devfile plugin with the above injector (Example - https://gitlab.com/gitlab-org/remote-development/gitlab-remote-development-docs/-/blob/main/examples/2-vscode.yaml)

Progress

• x86_64 image can be built using this process https://gitlab.com/gitlab-org/gitlab-web-ide-vscode-fork/-/blob/editor-injector/GL_EDITOR_INJECTOR.md (you have to use the editor-injector branch)
• then you can run
  • k apply -f 7-webide.yaml - to add the webide editor template
  • k apply -f 8-dw-with-webide.yaml - to create a workspace with dev template

Unsolved issues

• it's not possible to change the root directory in the workspace in WebIDE
• support multiple architectures
• build the injector as a part of the fork build process
• make sure that we understand which user runs the editor
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