Add ARM and ARM64 build configuration for powershell module

[ryfu-msft]

• Adds ARM64 build configuration for UndockedRegFreeWinRT and Detours projects.
• Modifies and cleans up build configurations in solution file.
• Refactored CopyWinRTAct.dll post-build step that depends on the target platform value.

GUID reference for reviewer:
{463C0EF3-DF38-4C3D-8E7E-D4901E0CDC6C} = Microsoft.WinGet.Client.csproj
{31ED69A8-5310-45A9-953F-56C351D2C3E1} = UndockedRegFreeWinRT.vcxproj
{787EC629-C0FB-4BA9-9746-4A82CD06B73E} = Detours.vcxproj

Microsoft Reviewers: Open in CodeFlow

[yao-msft]

BinSkim found 2 issues:

D:\a\1\s\src\x64\Release\UndockedRegFreeWinRT\winrtact.dll: error BA2008: 'winrtact.dll' does not enable the control flow guard (CFG) mitigation. To resolve this issue, pass /guard:cf on both the compiler and linker command lines. Binaries also require the /DYNAMICBASE linker option in order to enable CFG.

D:\a\1\s\src\x64\Release\UndockedRegFreeWinRT\winrtact.dll: warning BA2024: 'winrtact.dll' was compiled with one or more modules that do not enable code generation mitigations for speculative execution side-channel attack (Spectre) vulnerabilities. Spectre attacks can compromise hardware-based isolation, allowing