Move to DiaSymReader 2.0 (#8661)

The inclusion of System.Private.Uri as a package reference was done to
solve component governance issues. This came specificaly from including
`nestandard1.6` in our dependency graph via Microsoft.DiaSymReader.
There is now a `netstandard2.0` version of that package that we can move
to and, _should_, let us remove the System.Private.Uri references.

A [similar change](dotnet/roslyn#68055) is going
through roslyn now that will eventually let us remove this entirely. In
the meantime though it's fine to have an explicit reference here.

Author: jaredpar

eng/Versions.props

@@ -106,6 +106,7 @@
     <BenchmarkDotNetPackageVersion>0.13.2.2052</BenchmarkDotNetPackageVersion>
     <MicrosoftBuildLocatorPackageVersion>1.2.6</MicrosoftBuildLocatorPackageVersion>
     <MicrosoftBuildPackageVersion>16.8.0</MicrosoftBuildPackageVersion>
+    <MicrosoftDiaSymReaderVersion>2.0.0</MicrosoftDiaSymReaderVersion>
     <MicrosoftNETSdkRazorPackageVersion>6.0.0-alpha.1.21072.5</MicrosoftNETSdkRazorPackageVersion>
     <!-- Packages from dotnet/roslyn -->
     <MicrosoftNetCompilersToolsetVersion>$(MicrosoftNetCompilersToolsetPackageVersion)</MicrosoftNetCompilersToolsetVersion>

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks.csproj

@@ -54,7 +54,7 @@
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="$(BenchmarkDotNetPackageVersion)" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="$(MicrosoftExtensionsPackageVersion)" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="$(MicrosoftExtensionsPackageVersion)" />
-    <PackageReference Include="System.Private.Uri" Version="$(SystemPrivateUriPackageVersion)" ExcludeAssets="true" PrivateAssets="true" />
+    <PackageReference Include="Microsoft.DiaSymReader" Version="$(MicrosoftDiaSymReaderVersion)" />
   </ItemGroup>
 
 </Project>

src/Razor/src/rzls/rzls.csproj

@@ -47,7 +47,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Private.Uri" Version="$(SystemPrivateUriPackageVersion)" ExcludeAssets="true" PrivateAssets="true" />
+    <PackageReference Include="Microsoft.DiaSymReader" Version="$(MicrosoftDiaSymReaderVersion)" />
   </ItemGroup>
 
   <Target Name="PublishAllRids">