x/build/env/windows/arm64: add Windows arm64 builders provided by Microsoft

[cagedmantis]

Based on the comment left in #53383, we should work to setup reliable hardware and builders for the windows/arm64 port.

Microsoft dev here. We would like to help promoting windows/arm64 to be a first-class port. If it is just a problem of having reliable hardware, we can discuss providing reliable windows/arm64 hosts running in our own infrastructure. Would that be enough? If not, what else would be missing?

Originally posted by @qmuntal in #53383 (comment)

@qmuntal How would you like this discussion to proceed (GitHub discussion/email thread)?
@golang/release

[qmuntal]

Let's discuss the internals via email thread and report out when we have something solid. Please send it to golangdev@microsoft.com.

[qmuntal]

Quick update: We are still trying to figure out the logistics on our side. Getting a Windows ARM64 machine available 24/7 is not straightforward at this point, but we will get there.