Revert "[TFM Display] Add service that generates compatible frameworks. (#8869)"

This reverts commit 2d9bd91.

Author: agr

src/NuGet.Services.Entities/NuGet.Services.Entities.csproj

@@ -15,7 +15,7 @@
       <Version>10.0.3</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Frameworks">
-      <Version>6.0.0</Version>
+      <Version>5.9.0</Version>
     </PackageReference>
   </ItemGroup>
 

src/NuGetGallery.Core/Frameworks/FrameworkCompatibilityService.cs

@@ -82,8 +82,6 @@
     <Compile Include="Cookies\CookieExpirationServiceFacts.cs" />
     <Compile Include="Features\FeatureFlagClientExtensionsFacts.cs" />
     <Compile Include="Features\EditableFeatureFlagFileStorageServiceFacts.cs" />
-    <Compile Include="Frameworks\FrameworkCompatibilityServiceFacts.cs" />
-    <Compile Include="Frameworks\SupportedFrameworksFacts.cs" />
     <Compile Include="GitHub\GitHubUsageConfigurationFacts.cs" />
     <Compile Include="Infrastructure\ElmahExceptionFacts.cs" />
     <Compile Include="Extensions\UserExtensionsCoreFacts.cs" />