[repo] Remove implicit using tweak as it is no longer needed (open-telemetry#5887)

Co-authored-by: Piotr Kiełkowicz <[email protected]>

Author: CodeBlanch

src/Directory.Build.targets

@@ -16,15 +16,6 @@
     <EmbeddedFiles Include="$(GeneratedAssemblyInfoFile)"/>
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='$(NetFrameworkMinimumSupportedVersion)'">
-    <!--ImplicitUsings will add this namespace that is not available for NetFX.
-    https://github.com/dotnet/sdk/issues/24146
-    https://github.com/dotnet/runtime/issues/59163
-    https://github.com/dotnet/sdk/issues/22515
-    -->
-    <Using Remove="System.Net.Http" />
-  </ItemGroup>
-
   <ItemGroup Condition="'$(IsPackable)' == 'true'">
     <None Include="$(PackagePrimaryLicenseFile)"
           PackagePath="$([System.IO.Path]::GetFileName('$(PackagePrimaryLicenseFile)'))"

test/Directory.Build.targets

@@ -2,15 +2,6 @@
 
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildProjectDirectory), 'OpenTelemetry.sln'))\build\Common.targets" />
 
-  <ItemGroup Condition="'$(TargetFramework)'=='$(NetFrameworkMinimumSupportedVersion)'">
-    <!--ImplicitUsings will add this namespace that is not available for NetFX.
-    https://github.com/dotnet/sdk/issues/24146
-    https://github.com/dotnet/runtime/issues/59163
-    https://github.com/dotnet/sdk/issues/22515
-    -->
-    <Using Remove="System.Net.Http" />
-  </ItemGroup>
-
   <ItemGroup Condition="'$(ReferenceCoyotePackages)' == 'true'">
     <PackageReference Include="Microsoft.Coyote" />