Ban the appropriate MEF in the approprate project

eng/BannedSymbols.MEFv1.txt

@@ -0,0 +1 @@
+N:System.ComponentModel.Composition;Use MEF v2 in this project, from System.Composition

eng/BannedSymbols.MEFv2.txt

@@ -0,0 +1 @@
+N:System.Composition;Use MEF v1 in this project, from System.ComponentModel.Composition

src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/Microsoft.CodeAnalysis.Remote.Razor.csproj

@@ -19,6 +19,10 @@
     <NoWarn>$(NoWarn);NU1701</NoWarn>
   </PropertyGroup>
 
+  <ItemGroup>
+    <AdditionalFiles Include="$(RepoRoot)eng\BannedSymbols.MEFv1.txt" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Microsoft.CodeAnalysis.Razor.Workspaces\Microsoft.CodeAnalysis.Razor.Workspaces.csproj" />
   </ItemGroup>

src/Razor/src/Microsoft.VisualStudio.LanguageServices.Razor/Microsoft.VisualStudio.LanguageServices.Razor.csproj

@@ -10,6 +10,10 @@
     <IsPackable Condition="'$(OS)' != 'Windows_NT'">false</IsPackable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <AdditionalFiles Include="$(RepoRoot)eng\BannedSymbols.MEFv2.txt" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Sdk.Razor" Version="$(MicrosoftNETSdkRazorPackageVersion)" IncludeAssets="None" PrivateAssets="All" GeneratePathProperty="true" />
     <PackageReference Include="Microsoft.VisualStudio.Editor" Version="$(MicrosoftVisualStudioEditorPackageVersion)" />