Swamy/remove unused usings and reorganize usings (#489)

* Removed and Reordered the using statements

* Removed and Reordered the usings inside Web Project

* Removed and Reordered the usings inside PublicApi project

* Removed Unused usings and reorganized usings inside Infrastructure project

tests/IntegrationTests/Repositories/OrderRepositoryTests/GetById.cs

@@ -1,10 +1,10 @@
-using Microsoft.eShopWeb.Infrastructure.Data;
-using Microsoft.EntityFrameworkCore;
-using System.Linq;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.eShopWeb.Infrastructure.Data;
 using Microsoft.eShopWeb.UnitTests.Builders;
+using System.Linq;
+using System.Threading.Tasks;
 using Xunit;
 using Xunit.Abstractions;
-using System.Threading.Tasks;
 
 namespace Microsoft.eShopWeb.IntegrationTests.Repositories.OrderRepositoryTests
 {