Disable AD0001 as workaround for analyzer bug

The current version of .NET 8.0 contains a bug [1] in
`RouteHandlerAnalyzer` that causes it to throw
`InvalidOperationException` with message 'Failed to resolve well-known
type 'Microsoft.AspNetCore.Builder.EndpointRouteBuilderExtensions' when
the application references any libraries that declare methods in the
`Microsoft.AspNetCore.Builder.EndpointRouteBuilderExtensions` static
class.

A fix [2]  is expected [3] to be included in an upcoming .NET 8 patch
release.

[1] dotnet/aspnetcore#50836
[2] dotnet/aspnetcore#50969
[3] dotnet/aspnetcore#50836 (comment)

src/Buttercup.Web/Buttercup.Web.csproj

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <UserSecretsId>1b20fb70-92de-4af7-9518-6cfe3805821e</UserSecretsId>
     <DefaultItemExcludes>$(DefaultItemExcludes);coverage/*;.prettierrc.json;package.json;package-lock.json;tsconfig.json</DefaultItemExcludes>
+    <NoWarn>$(NoWarn);AD0001</NoWarn>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Bugsnag.AspNet.Core" Version="3.1.0" />