Revert "Test | Expose internal types to ManualTests (#3239)" (#3268)

This reverts commit 41b9345.

Author: mdaigle

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -32,9 +32,6 @@
   <PropertyGroup>
     <TargetFrameworkMonikerAssemblyAttributesPath>$([System.IO.Path]::Combine('$(IntermediateOutputPath)','$(TargetFramework)','$(TargetFrameworkMoniker).AssemblyAttributes$(DefaultLanguageSourceExtension)'))</TargetFrameworkMonikerAssemblyAttributesPath>
   </PropertyGroup>
-  <ItemGroup>
-    <InternalsVisibleTo Include="ManualTests" />
-  </ItemGroup>
   <ItemGroup>
     <EmbeddedFiles Include="$(GeneratedAssemblyInfoFile)" />
     <EmbeddedFiles Include="$(TargetFrameworkMonikerAssemblyAttributesPath)" />

src/Microsoft.Data.SqlClient/netfx/src/AssemblyInfo.cs

@@ -869,7 +869,6 @@
     </Compile>
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="Common\Microsoft\Data\Common\NameValuePermission.cs" />
     <Compile Include="Microsoft\Data\Common\DbConnectionOptions.cs" />
     <Compile Include="Microsoft\Data\Common\DbConnectionString.cs" />