ci(vscode): run tests on a Windows machine

[alestiago]

Description

Currently the VS Code workflow runs on Mac, see:

dart_frog/.github/workflows/dart_frog_vscode.yaml

Line 25 in f39709d

runs-on: macos-latest

As a maintainer I would like the CI to also run on Windows in order to catch issues before publishing.

Requirements

• Include workflow that runs tests on Windows
• Ensure test suite passes on Windows

References

• fix(vscode): windows compatible new route and middleware #1062
• fix(vscode): extension caused Git to get stuck in "Scanning folder for git repositories" #1059