Add MergeUsageAnalyzer to detect legacy merge service usage

- Implemented MergeUsageAnalyzer to flag usage of AdvisoryMergeService and AddMergeModule.
- Created AnalyzerReleases.Shipped.md and AnalyzerReleases.Unshipped.md for release documentation.
- Added tests for MergeUsageAnalyzer to ensure correct diagnostics for various scenarios.
- Updated project files for analyzers and tests to include necessary dependencies and configurations.
- Introduced a sample report structure for scanner output.

NuGet.config

@@ -1,25 +1,25 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <config>
-    <add key="restoreIgnoreFailedSources" value="true" />
-  </config>
-  <packageSources>
-    <clear />
-    <add key="local" value="local-nuget" />
-    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-  </packageSources>
-  <packageSourceMapping>
-    <packageSource key="local">
-      <package pattern="Mongo2Go" />
-      <package pattern="Microsoft.IdentityModel.Tokens" />
-      <package pattern="Microsoft.Extensions.Http.Polly" />
-      <package pattern="Microsoft.Extensions.Caching.Memory" />
-      <package pattern="Microsoft.Extensions.Configuration" />
-      <package pattern="Microsoft.Extensions.Configuration.Binder" />
-      <package pattern="Microsoft.Extensions.DependencyInjection.Abstractions" />
-      <package pattern="Microsoft.Extensions.Hosting" />
-      <package pattern="Microsoft.Extensions.Hosting.Abstractions" />
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <config>
+    <add key="restoreIgnoreFailedSources" value="true" />
+  </config>
+  <packageSources>
+    <clear />
+    <add key="local" value="local-nuget" />
+    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+  <packageSourceMapping>
+    <packageSource key="local">
+      <package pattern="Mongo2Go" />
+      <package pattern="Microsoft.IdentityModel.Tokens" />
+      <package pattern="Microsoft.Extensions.Http.Polly" />
+      <package pattern="Microsoft.Extensions.Caching.Memory" />
+      <package pattern="Microsoft.Extensions.Configuration" />
+      <package pattern="Microsoft.Extensions.Configuration.Binder" />
+      <package pattern="Microsoft.Extensions.DependencyInjection.Abstractions" />
+      <package pattern="Microsoft.Extensions.Hosting" />
+      <package pattern="Microsoft.Extensions.Hosting.Abstractions" />
       <package pattern="Microsoft.Extensions.Http" />
       <package pattern="Microsoft.Extensions.Logging.Abstractions" />
       <package pattern="Microsoft.Extensions.Options" />
@@ -28,9 +28,23 @@
       <package pattern="Microsoft.IdentityModel.Logging" />
       <package pattern="Microsoft.IdentityModel.Abstractions" />
       <package pattern="Microsoft.AspNetCore.Authentication.JwtBearer" />
-      <package pattern="Google.Protobuf" />
+      <package pattern="Google.Protobuf" />
+      <package pattern="Microsoft.CodeAnalysis.*" />
+      <package pattern="Microsoft.Bcl.AsyncInterfaces" />
+      <package pattern="Humanizer.Core" />
+      <package pattern="System.Collections.Immutable" />
+      <package pattern="System.Composition*" />
+      <package pattern="System.IO.Pipelines" />
+      <package pattern="System.Memory" />
+      <package pattern="System.Numerics.Vectors" />
+      <package pattern="System.Reflection.Metadata" />
+      <package pattern="System.Runtime.CompilerServices.Unsafe" />
+      <package pattern="System.Text.Encoding.CodePages" />
+      <package pattern="System.Threading.Channels" />
+      <package pattern="System.Threading.Tasks.Extensions" />
+      <package pattern="NETStandard.Library" />
       <package pattern="Grpc.*" />
-    </packageSource>
+    </packageSource>
     <packageSource key="dotnet-public">
       <package pattern="Microsoft.Extensions.*" />
       <package pattern="Microsoft.AspNetCore.*" />
@@ -38,8 +52,8 @@
       <package pattern="Microsoft.OpenApi*" />
       <package pattern="System.Diagnostics.*" />
     </packageSource>
-    <packageSource key="nuget.org">
-      <package pattern="*" />
-    </packageSource>
-  </packageSourceMapping>
-</configuration>
+    <packageSource key="nuget.org">
+      <package pattern="*" />
+    </packageSource>
+  </packageSourceMapping>
+</configuration>