feat: add Shouldly global using and remove from ExceptionMiddlewareTests

Author: kamilbaczek

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Common/Fitnet.Common.Api.UnitTests/ExceptionMiddlewareTests.cs

@@ -7,7 +7,6 @@ namespace EvolutionaryArchitecture.Fitnet.Common.Api.UnitTests;
 using ErrorHandling;
 using Microsoft.AspNetCore.Http;
 using Newtonsoft.Json;
-using Shouldly;
 using Xunit;
 
 public sealed class ExceptionMiddlewareTests

Chapter-4-applying-tactical-domain-driven-design/Fitnet.Common/Fitnet.Common.Api.UnitTests/GlobalUsings.cs

@@ -2,4 +2,5 @@
 global using Xunit;
 global using FluentAssertions;
 global using Microsoft.AspNetCore.Http;
-global using Newtonsoft.Json;
+global using Newtonsoft.Json;
+global using Shouldly;