Fix vscode-playwright-mcp building & improve tools listed in demonstrate (#278856)

1. the mcp server wasn't working... perhaps due to our js -> ts build move... or a bump in a npm package. Either way, good now.
2. I list out all tools across Copilot CLI & VS Code that would apply in this case... there's some overlap for sure... but I want to make sure we're golden for any renamed tools situations.