[sdk_v2] disables generation of apphost.exe for test suite

[prathikr]

This works since dotnet test directly runs the generated testing .dll so the native .exe is not needed.

C:\Program Files\dotnet\sdk\10.0.201\Microsoft.Common.CurrentVersion.targets(5395,5): error MSB3030: Could not copy the file 
"D:\a\Foundry-Local\Foundry-Local\sdk_v2\cs\test\FoundryLocal.Tests\obj\Debug\net9.0\win-x64\apphost.exe" because it was not 
found. [D:\a\Foundry-Local\Foundry-Local\sdk_v2\cs\test\FoundryLocal.Tests\Microsoft.AI.Foundry.Local.Tests.csproj]

[vercel]

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Project	Deployment	Actions	Updated (UTC)
foundry-local	Ready	Preview, Comment	Mar 17, 2026 9:32pm