Redist packages each include all architectures and is quite large as a result

Nobody has claimed this yet.

### Describe the bug

The redist packages all appear to be 3x the size they need to be. Looking inside the x64 one, for example, I see 20mb of Arm64 binary, 22mb of x64, and 20mb of x86. There's a separate Arm64 redist, and it has the same.


These were downloaded from the official redist zip referenced on mslearn.
https://learn.microsoft.com/en-us/windows/apps/windows-app-sdk/downloads

Appears to be the same thing regardless of version or if zipped or standalone.

### Steps to reproduce the bug

Go to the link above.
Download the zip
Unpack the installers and peek inside.

### Expected behavior

Only include binaries for the target architecture.

### Screenshots

_No response_

### NuGet package version

None

### Packaging type

Unpackaged

### Windows version

Windows 11 version 22H2 (22621, 2022 Update)

### IDE

_No response_

### Additional context

_No response_

Start with the official redist ZIP from the Windows App SDK downloads page and inspect the unpacked architecture-specific installers. Compare the x64, Arm64, and x86 package contents, then verify that each package contains only binaries for its target architecture and that the ZIP and standalone variants behave consistently.

Written by the indexing model from the issue text.