Pin dependency on Microsoft.CSharp (#19063)

* Pin dependency on Microsoft.CSharp

* Use 4.7.0 version

* Remove CSharp for versions.details.xml

* Move Microsoft.CSharp to manual section of versions.props

eng/Version.Details.xml

@@ -289,10 +289,6 @@
       <Uri>https://github.com/dotnet/extensions</Uri>
       <Sha>396aff55e0b4628a7a44375e4b72e5d19a6e37ab</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.CSharp" Version="5.0.0-alpha.1.19563.6" CoherentParentDependency="Microsoft.NETCore.App.Runtime.win-x64">
-      <Uri>https://github.com/dotnet/corefx</Uri>
-      <Sha>5cee7c97d602f294e27c582d4dab81ec388f1d7b</Sha>
-    </Dependency>
     <Dependency Name="Microsoft.Win32.Registry" Version="5.0.0-preview.1.20113.7" CoherentParentDependency="Microsoft.NETCore.App.Runtime.win-x64">
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>0f3f8e1930c28b67f29990126bc2e8527e959a2e</Sha>

eng/Versions.props

@@ -63,14 +63,12 @@
     <MicrosoftDotNetGenAPIPackageVersion>5.0.0-beta.20113.3</MicrosoftDotNetGenAPIPackageVersion>
     <!-- Packages from dotnet/roslyn -->
     <MicrosoftNetCompilersToolsetPackageVersion>3.5.0-beta3-20114-02</MicrosoftNetCompilersToolsetPackageVersion>
-    <!-- Packages from dotnet/core-setup -->
+    <!-- Packages from dotnet/runtime -->
     <MicrosoftExtensionsDependencyModelPackageVersion>5.0.0-preview.1.20113.7</MicrosoftExtensionsDependencyModelPackageVersion>
     <MicrosoftNETCoreAppInternalPackageVersion>5.0.0-preview.1.20113.7</MicrosoftNETCoreAppInternalPackageVersion>
     <MicrosoftNETCoreAppRefPackageVersion>5.0.0-preview.1.20113.7</MicrosoftNETCoreAppRefPackageVersion>
     <MicrosoftNETCoreAppRuntimewinx64PackageVersion>5.0.0-preview.1.20113.7</MicrosoftNETCoreAppRuntimewinx64PackageVersion>
     <NETStandardLibraryRefPackageVersion>2.1.0-preview.1.20113.7</NETStandardLibraryRefPackageVersion>
-    <!-- Packages from dotnet/corefx -->
-    <MicrosoftCSharpPackageVersion>5.0.0-alpha.1.19563.6</MicrosoftCSharpPackageVersion>
     <MicrosoftWin32RegistryPackageVersion>5.0.0-preview.1.20113.7</MicrosoftWin32RegistryPackageVersion>
     <MicrosoftWin32SystemEventsPackageVersion>5.0.0-preview.1.20113.7</MicrosoftWin32SystemEventsPackageVersion>
     <SystemComponentModelAnnotationsPackageVersion>5.0.0-preview.1.20113.7</SystemComponentModelAnnotationsPackageVersion>
@@ -192,6 +190,7 @@
     <MicrosoftSymbolUploaderBuildTaskPackageVersion>1.0.0-beta-64023-03</MicrosoftSymbolUploaderBuildTaskPackageVersion>
     <MicrosoftVSSDKBuildToolsVersion>15.9.3032</MicrosoftVSSDKBuildToolsVersion>
     <!-- Stable dotnet/corefx packages no longer updated for .NET Core 3 -->
+    <MicrosoftCSharpPackageVersion>4.7.0</MicrosoftCSharpPackageVersion>
     <SystemBuffersPackageVersion>4.5.0</SystemBuffersPackageVersion>
     <SystemCodeDomPackageVersion>4.4.0</SystemCodeDomPackageVersion>
     <SystemCommandlineExperimentalPackageVersion>0.3.0-alpha.19317.1</SystemCommandlineExperimentalPackageVersion>