Provide Windows x86 native AoT published binaries for .NET 10

[vcsjones]

AzureSignTool currently provides 32-bit Windows (x86) support via NuGet only, whereas x64 and ARM64 are supported for both NuGet and independent native AoT binaries. The reason for the lack of an x86 NAOT binary is that .NET did not support 32-bit Windows for Native AoT. A non-NAOT but fully self-contained x86 binary was frankly too big.

.NET 9 however added support for Windows x86 Native AoT. Since .NET 9 is a STS release, we won't move AzureSignTool to .NET 9. However, when .NET 10 comes out sometime in 2025 we could make sure we enable 32-bit Windows releases.