[release/6.0] `<TargetFrameworks />` -> `<TargetFramework />` (#37121)

- backport of #36727

`<TargetFrameworks />` -> `<TargetFramework />` (#36727)

  * `<TargetFrameworks />` -> `<TargetFramework />`
    - avoid useless transitions to inner builds
  * Remove most `$(BenchmarksTargetFramework)` use

Co-authored-by: Sébastien Ros <sebastienros@gmail.com>

src/Security/Authentication/test/Microsoft.AspNetCore.Authentication.Test.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

src/Security/Authorization/test/Microsoft.AspNetCore.Authorization.Test.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

src/Security/CookiePolicy/samples/CookiePolicySample/CookiePolicySample.csproj

 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

src/Security/CookiePolicy/test/Microsoft.AspNetCore.CookiePolicy.Test.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>

src/Servers/Kestrel/Kestrel/test/Microsoft.AspNetCore.Server.Kestrel.Tests.csproj

@@ -19,13 +19,8 @@
     <Content Include="$(KestrelRoot)Core\src\Internal\Http2\Http2Connection.Generated.cs" LinkBase="shared\GeneratedContent" CopyToOutputDirectory="PreserveNewest" />
     <Content Include="$(KestrelSharedSourceRoot)\TransportConnection.Generated.cs" LinkBase="shared\GeneratedContent" CopyToOutputDirectory="PreserveNewest" />
     <Content Include="$(KestrelSharedSourceRoot)\TransportMultiplexedConnection.Generated.cs" LinkBase="shared\GeneratedContent" CopyToOutputDirectory="PreserveNewest" />
-  </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETFramework'">
     <ProjectReference Include="..\..\tools\CodeGenerator\CodeGenerator.csproj" />
-  </ItemGroup>
-
-  <ItemGroup>
     <Reference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv" />
     <Reference Include="Microsoft.AspNetCore.Server.Kestrel" />
   </ItemGroup>

src/Servers/testassets/ServerComparison.TestSites/ServerComparison.TestSites.csproj

@@ -3,7 +3,7 @@
   <Import Project="$(RepoRoot)src\Servers\IIS\build\testsite.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <RuntimeIdentifiers>win-x86;win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
     <InProcessTestSite>true</InProcessTestSite>
   </PropertyGroup>

src/Shared/test/Shared.Tests/Microsoft.AspNetCore.Shared.Tests.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <DebugType>portable</DebugType>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <NoWarn>$(NoWarn);CS0649;CS0436</NoWarn><!-- Not all APIs are called in the shared test project --><!-- Conflicts between internal and public Quic APIs -->

src/SignalR/samples/JwtClientSample/JwtClientSample.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <OutputType>Exe</OutputType>
   </PropertyGroup>
 

src/Tools/Extensions.ApiDescription.Client/src/Microsoft.Extensions.ApiDescription.Client.csproj

@@ -8,7 +8,7 @@
     <NuspecFile>$(MSBuildProjectName).nuspec</NuspecFile>
     <PackageId>$(MSBuildProjectName)</PackageId>
     <PackageTags>Build Tasks;MSBuild;Swagger;OpenAPI;code generation;Web API client;service reference</PackageTags>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <TargetFramework>netstandard2.0</TargetFramework>
     <DevelopmentDependency>true</DevelopmentDependency>
   </PropertyGroup>
 

src/Tools/dotnet-user-secrets/test/UserSecretsTestFixture.cs

@@ -36,7 +36,7 @@ namespace Microsoft.Extensions.Configuration.UserSecrets.Tests
         private const string ProjectTemplate = @"<Project ToolsVersion=""15.0"" Sdk=""Microsoft.NET.Sdk"">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net6.0</TargetFrameworks>
+    <TargetFramework>net6.0</TargetFramework>
     {0}
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
   </PropertyGroup>