Remove workarounds for bugs in Microsoft.VisualStudio.Extensibility.JsonGenerators.Sdk (#79182)

Author: jasonmalinowski

eng/Directory.Packages.props

@@ -61,9 +61,9 @@
     <PackageVersion Include="Microsoft.VisualStudio.SDK" Version="18.0.1306-preview.1" />
     <PackageVersion Include="Microsoft.Internal.VisualStudio.Shell.Framework" Version="18.0.1211-preview.1" />
     <PackageVersion Include="Microsoft.ServiceHub.Client" Version="4.2.1017" />
-    <PackageVersion Include="Microsoft.VisualStudio.Extensibility.Sdk" Version="17.13.40008" />
-    <PackageVersion Include="Microsoft.VisualStudio.Extensibility" Version="17.12.2037-preview3" />
-    <PackageVersion Include="Microsoft.VisualStudio.Extensibility.JsonGenerators.Sdk" Version="17.12.2037-preview3" />
+    <PackageVersion Include="Microsoft.VisualStudio.Extensibility.Sdk" Version="18.0.52-preview1" />
+    <PackageVersion Include="Microsoft.VisualStudio.Extensibility" Version="18.0.52-preview1" />
+    <PackageVersion Include="Microsoft.VisualStudio.Extensibility.JsonGenerators.Sdk" Version="18.0.52-preview1" />
     <PackageVersion Include="Microsoft.VSSDK.Debugger.VSDConfigTool" Version="17.13.1100801-preview" />
     <PackageVersion Include="Microsoft.VisualStudio.Imaging" Version="18.0.1306-preview.1" />
     <PackageVersion Include="Microsoft.VisualStudio.ProjectSystem" Version="17.0.77-pre-g62a6cb5699" />

eng/targets/Imports.targets

@@ -3,7 +3,6 @@
 <Project>
   <Import Project="VisualStudio.targets" Condition="'$(UsingToolVSSDK)' == 'true'"/>
   <Import Project="XUnit.targets" Condition="'$(IsTestProject)' == 'true'" />
-  <Import Project="WpfTempProjectWorkarounds.targets" Condition="'$(IsWpfTempProject)' == 'true'" />
 
   <!--
     Work around .editorconfig evaluation bugs in command line builds.