Test: Remove node-pty dependency from @devcontainers/cli

[chrmarti]

Refs: #8698

• macOS @gregvanl
• linux @Tyriar
• windows @hediet

Complexity: 2

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• Install @devcontainers/cli (note that it does not compile any native module): npm i -g @devcontainers/cli
• Verify its subprocesses still use terminal escape sequences for rendering, e.g., docker build should show progress bars when building an image:

git clone https://github.com/microsoft/vscode-remote-try-node.git
cd vscode-remote-try-node
devcontainer build --workspace-folder .