ci(vscode): run tests on a Windows machine

[alestiago]

Description

Currently the VS Code workflow runs on Mac, see: https://github.com/VeryGoodOpenSource/dart_frog/blob/f39709de266c7f9cf2011bb272f73e96362520a8/.github/workflows/dart_frog_vscode.yaml#L25

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

• #1062
• #1059