fix(DIExtensions): AutoMapper-Konfiguration von UserManager hinzugefügt.

- In das Hauptverzeichnis des Projekts verschoben.
 - Umbenennen in DependencyInjection

EnvelopeGenerator.Tests.Application/Mock.cs

@@ -1,10 +1,10 @@
 using Microsoft.Extensions.Hosting;
-using EnvelopeGenerator.Application.Extensions;
 using EnvelopeGenerator.Infrastructure;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using EnvelopeGenerator.Application.Services;
 using Microsoft.EntityFrameworkCore;
+using EnvelopeGenerator.Application;
 
 namespace EnvelopeGenerator.Tests.Application;