Add nullable and generated code annotations

src/SponsorLink/SponsorLink/DiagnosticsManager.cs

@@ -2,7 +2,6 @@
 #nullable enable
 using System;
 using System.Collections.Concurrent;
-using System.Diagnostics.CodeAnalysis;
 using Humanizer;
 using Microsoft.CodeAnalysis;
 

src/SponsorLink/SponsorLink/ManifestStatus.cs

@@ -1,5 +1,4 @@
 // <autogenerated />
-#nullable enable
 namespace Devlooped.Sponsors;
 
 /// <summary>

src/SponsorLink/SponsorLink/SponsorLinkAnalyzer.cs

@@ -1,4 +1,6 @@
-using System;
+// <autogenerated />
+#nullable enable
+using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Diagnostics;

src/SponsorLink/SponsorLink/ThisAssembly.cs

@@ -1,4 +1,5 @@
-partial class ThisAssembly
+// <autogenerated />
+partial class ThisAssembly
 {
     partial class Strings
     {