CI Testing for Windows

[adambkaplan]

Since we are cross-compiling the shp binary, we should ensure that all tests work on a Windows client.

GitHub actions now support Windows based runners - it is not clear if all of our dependent actions also support these runners (ex - install Docker, KinD, etc.)

See https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners

[adambkaplan]

/kind cleanup

[coreydaley]

/assign @coreydaley