refactor(DocSignedNotificationTests): add again EmailOut DbRepository using Fake.EGDbContext2Prod

- create base EGDbContextBase to be able to add custom DbContextOptions

EnvelopeGenerator.Tests.Application/DocSignedNotificationTests.cs

@@ -1,5 +1,7 @@
 using AutoMapper;
 using DigitalData.Core.Abstraction.Application.Repository;
+using DigitalData.Core.Infrastructure;
+using DigitalData.EmailProfilerDispatcher.Abstraction.Entities;
 using EnvelopeGenerator.Application.Common.Dto.EnvelopeReceiver;
 using EnvelopeGenerator.Application.Common.Notifications.DocSigned;
 using EnvelopeGenerator.Application.Common.Notifications.DocSigned.Handlers;
@@ -14,6 +16,9 @@ public class DocSignedNotificationTests : TestBase
     protected override void ConfigureServices(IServiceCollection services)
     {
         services.AddTransient<SendSignedMailHandler>();
+
+        // overwrite EmailOutRepository
+        services.AddDbRepository(opt => opt.RegisterEntity<Fake.EGDbContext2Prod, EmailOut>(ctx => ctx.EMailOuts))
     }
 
     public override async Task Setup()