NeutralResourcesLanguageAttribute missing

[BradBarnich]

Describe the bug

in the 6.x series the NeutralResourcesLanguageAttribute is missing from the netfx assembly (regression of #426)

I think it was after csproj was converted to sdk style in #2413, as the way of overriding BeforeBuild (in GenerateAssemblyInfo.targets) doesn't work with implicit targets (dotnet/msbuild#9327)

You can also see this in the msbuild log:

Overriding target "BeforeBuild" in project "C:\Users\Brad\Code\SqlClient\src\Microsoft.Data.SqlClient\netfx\tools\targets\GenerateAssemblyInfo.targets" with target "BeforeBuild" from project "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets".

In the same contexts as the original issue, when the assembly is loaded, tries to locate the en-us dll and fails

To reproduce

Inspect the produced dll, missing assembly attribute

Expected behavior

Expect the attribute to be there

Further technical details

Microsoft.Data.SqlClient version: 6.x
.NET target: .NET Framework