VPN-2199: Windows ARM Support

[oskirby]

Description

This should get most of the way towards producing an arm64 build for Windows. Much of the heavy lifting to get here was previously done by the work to get cross-compilation to Windows working from Linux.

This PR:

• Updates the Rust version and adds the aarch64-pc-windows-msvc target.
• Undo hardcoded assumptions that Windows implies x86-64.
• Split the windows cross toolchain files into x86_64-toolchain.cmake and aarch64-toolchain.cmake
• Install both x64 and arm64 targets of the windows SDK into the cross conda environment.
• Add a toolchain job to fetch the VS2022 SDK for arm64.
• Add a toolchain job to build static Qt for arm64 on Windows.
• Patch in a workaround for build: Only replace cl.exe with clang-cl for ARM64 Windows builds briansmith/ring#2216

I am currently struggling a bit to figure out how to package the resulting artifacts as an MSI installer, so I think I am going to leave that piece for a future PR.

Reference

JIRA Issue: VPN-2199
Depends on: briansmith/ring#2216
Depends on: Bugzilla 1944293

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[strseb]

RN we only have level-1 Workers, we should followup with releng, that we also get the level-3 queue up before we merge this, otherwise those tasks will be stuck :)

[oskirby]

Ah! Good to know

[strseb]

I think this breaks the tc-ios tasks :c

[oskirby]

Looks like the change that broke things was getsentry/sentry-native#1083 which got released in sentry-native 0.7.14. We could probably just revert that back to 0.7.13 to get unstuck, which still includes the fixes for Windows arm64.

[strseb]

Amazing stuff, thank you so much!!