Disable Windows arm32 builds for release/5.0

[jkotas]

We have announced that Windows arm32 is not going to be supported in https://github.com/dotnet/core/blob/master/release-notes/5.0/5.0-supported-os.md and we have turned off testing for Windows ARM32 in .NET 5.

Actual result: Windows arm32 builds are listed at https://github.com/dotnet/installer/ and https://dotnet.microsoft.com/download/dotnet/5.0

Expected result: Windows arm32 builds are not listed at https://github.com/dotnet/installer/ and https://dotnet.microsoft.com/download/dotnet/5.0 .

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[mairaw]

Windows ARM32 builds were pulled out of https://dotnet.microsoft.com/download/dotnet/5.0

[ViktorHofer]

Would it make sense to have this issue in dotnet/installer as it seems their README update is the last thing to do?

[am11]

This was fixed by #8570.