feat: Remove Node.js runtime dependencies from docfx tools

[filzrev]

This PR intended to resolve #9396.

Background

Playwright 1.41 or later supports following environment variables. (It's not documented though)

• PLAYWRIGHT_NODEJS_PATH
• PLAYWRIGHT_DRIVER_SEARCH_PATH

So it can remove Node.js runtime from docfx package. Instead. it can use locally installed Node.js runtime instead.

By this changes. docfx packages size can be reduced from 208MB -> 56 MB

BREAKING CHANGES This PR remove Node.js runtime bundles. So it may introduce breaking changes for some users who using docfx without Node.js installation. (e.g. docker image users)

I'll try to fix official docker image later. https://github.com/dotnet/docfx/blob/main/Dockerfile

[filzrev]

When using CommandUtility.ExistCommand helper methods. It need to handle stdout result parse logics. Because of following reasons.

• On GitHub runner environment multiple node.js installations found by where command (Windows)
  • it's possible to search node command on current directory by where command.
• node is prefix string appended by type command (Linux/mac)

So I've reverted code to PATH based search logics.