ci: validate OpenVSCode server output paths

[tariqsaidofficial]

Summary

Updates the WPCodeSpace OpenVSCode Server Archive Validation workflow to validate the actual server output directories.

Why

The server packaging task writes outputs to BUILD_ROOT, where BUILD_ROOT is the parent of the repository root.

In GitHub Actions, the expected outputs are outside the checked-out repository directory:

• ../vscode-reh-linux-x64
• ../vscode-reh-web-linux-x64

The previous listing searched inside the repository only, so it did not show the built output directories.

What this validates

The workflow now confirms both expected output directories exist and prints:

• repository path
• parent build root contents
• first files from each server output directory
• output directory sizes

Scope

CI workflow only.

No source changes.

No Docker changes.

No generated runtime files committed.

No WPCodeSpace consumption changes.