Prepare repo to build 2.2.1

* Update dependencies to 2.2.0 rtm
* Update branding to 2.2.1
* Update package baselines to 2.2.0
* Add a restore source for 2.2.0 RTM

src/Analyzers/Microsoft.AspNetCore.Analyzer.Testing/src/Microsoft.AspNetCore.Analyzer.Testing.csproj

@@ -5,6 +5,8 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <PackageTags>$(PackageTags);testing</PackageTags>
     <EnableApiCheck>false</EnableApiCheck>
+    <!-- This package is internal, so we don't generate a package baseline. Always build against the latest dependencies. -->
+    <UseLatestPackageReferences>true</UseLatestPackageReferences>
   </PropertyGroup>
 
   <ItemGroup>