NuGet: Set EnableWindowsTargeting as true

[na1307]

Fixes: #8971, Fixes #8572

This prevents NETSDK1100 errors from occurring for Windows-specific apps.

[JoeRobich]

I love that it is such a simple fix.

[JoeRobich]

@na1307 Could you add a test case for this to UpdateWorkerTests.SDK.cs?

Something like this should work, based on code sample in #8572

        [Fact]
        public async Task UpdateVersionAttribute_InProjectFile_ForPackageReferenceInclude_Windows()
        {
            // update Newtonsoft.Json from 9.0.1 to 13.0.1
            await TestUpdateForProject("Newtonsoft.Json", "9.0.1", "13.0.1",
                // initial
                projectContents: $"""
                <Project Sdk="Microsoft.NET.Sdk">
                  <PropertyGroup>
                    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
                    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
                  </PropertyGroup>
                
                  <ItemGroup>
                    <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
                  </ItemGroup>
                </Project>
                """,
                // expected
                expectedProjectContents: $"""
                <Project Sdk="Microsoft.NET.Sdk">
                  <PropertyGroup>
                    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
                    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
                  </PropertyGroup>
                
                  <ItemGroup>
                    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
                  </ItemGroup>
                </Project>
                """);
        }

[JoeRobich]

Thanks @na1307!

[Nishnha]

Hi I'm deploying this