ci: explore using ReFS drive to speed up Windows CI jobs

[rfratto]

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[rfratto]

While there are reports of another project successfully using ReFS drives to speed up CI, there's a few issues preventing Alloy from using it right now:

1. Creating a ReFS drive (the New-VHD command) doesn't work with windows-2019. My understanding is that the Windows version must match the Windows version of Docker images, which is windows-2019; upgrading may not be a choice right now.

2. Commands like go build and docker build still have on-disk caches on the normal drive, where they don't take advantages of the performance boosts. While it may be possible to reconfigure the Docker and Go to place caches on the mounted drive, this would be somewhat of a large burden, and issue 1 prevents this from being productive anyway.

Closing for now, but maybe in the future all Windows runners use ReFS by default and things will be faster.