Remove netstandard packaging infra (dotnet#40239)

eng/Subsets.props

@@ -215,15 +215,11 @@
   <ItemGroup Condition="$(_subset.Contains('+installer.depprojs+'))">
     <DepprojProjectToBuild Condition="'$(RuntimeFlavor)' == 'CoreCLR'" Include="$(InstallerProjectRoot)pkg\projects\**\*.depproj" SignPhase="R2RBinaries" BuildInParallel="false" />
     <DepprojProjectToBuild Condition="'$(RuntimeFlavor)' == 'Mono'" Include="$(InstallerProjectRoot)pkg\projects\**\*.depproj" SignPhase="Binaries" BuildInParallel="false" />
-    <!-- Disable netstandard infra for now and discuss if we should delete it: https://github.com/dotnet/runtime/issues/2294-->
-    <DepprojProjectToBuild Remove="$(InstallerProjectRoot)pkg\projects\netstandard\src\netstandard.depproj" BuildInParallel="true" />
     <ProjectToBuild Include="@(DepprojProjectToBuild)" Pack="true" Category="installer" />
   </ItemGroup>
 
   <ItemGroup Condition="$(_subset.Contains('+installer.pkgprojs+'))">
     <PkgprojProjectToBuild Include="$(InstallerProjectRoot)pkg\projects\**\*.pkgproj" SignPhase="MsiFiles" BuildInParallel="false" />
-    <!-- Disable netstandard infra for now and discuss if we should delete it: https://github.com/dotnet/runtime/issues/2294-->
-    <PkgprojProjectToBuild Remove="$(InstallerProjectRoot)pkg\projects\netstandard\pkg\NETStandard.Library.Ref.pkgproj" BuildInParallel="true" />
     <ProjectToBuild Include="@(PkgprojProjectToBuild)" Pack="true" Category="installer" />
   </ItemGroup>
 

eng/Versions.props

@@ -46,9 +46,6 @@
   <ItemGroup>
     <!-- Targeting packs are only patched in extreme cases. -->
     <ProjectServicingConfiguration Include="Microsoft.NETCore.App.Ref" PatchVersion="0" />
-    <!-- Setting PatchVersion to "N/A" to not build it now or in the future, as "N/A" will never match the actual patch version. -->
-    <!-- For more info see this issue: https://github.com/dotnet/runtime/issues/2294 -->
-    <ProjectServicingConfiguration Include="NETStandard.Library.Ref" PatchVersion="N/A" />
   </ItemGroup>
   <PropertyGroup>
     <!-- Arcade dependencies -->
@@ -176,7 +173,7 @@
     <MicrosoftNETCoreRuntimeICUTransportPackage>Microsoft.NETCore.Runtime.ICU.Transport</MicrosoftNETCoreRuntimeICUTransportPackage>
     <!-- XmlDocFileRoot needs to be defined here since we use it in packaging.props and docs.targets.
     It also uses Arcade defined property NuGetPackageRoot, this is the only codepath shared in between
-    packaging.props and docs.targets with arcade properties defined. 
+    packaging.props and docs.targets with arcade properties defined.
     -->
     <XmlDocFileRoot>$([MSBuild]::NormalizeDirectory('$(NuGetPackageRoot)', '$(MicrosoftPrivateIntellisensePackage)', '$(MicrosoftPrivateIntellisenseVersion)', 'IntellisenseFiles', 'net'))</XmlDocFileRoot>
   </PropertyGroup>

src/installer/pkg/projects/descriptions.json

@@ -48,10 +48,5 @@
         "Name": "Microsoft.NETCore.App.Ref",
         "Description": "A set of .NET APIs that are included in the default .NET application model. Contains reference assemblies, documentation, and other design-time assets.",
         "CommonTypes": [ ]
-    },
-    {
-        "Name": "NETStandard.Library.Ref",
-        "Description": "A set of standard .NET APIs that are prescribed to be used and supported together. Contains reference assemblies, documentation, and other design-time assets.",
-        "CommonTypes": [ ]
     }
 ]