Update dependencies and integrate EnvelopeGenerator

Updated `DigitalData.Auth.Tests.csproj` to include `Microsoft.EntityFrameworkCore` version `8.0.17`.

Refactored `AuthController.cs` to remove unused imports and update to the latest `DigitalData.Core.Abstraction.Application` namespaces.

Streamlined `DigitalData.Auth.API.csproj`:
- Changed target framework to `net8.0`.
- Upgraded `DigitalData.Core.Abstractions` to `4.3.0` and `DigitalData.Core.Application` to `3.4.0`.
- Added `EnvelopeGenerator` and `Microsoft.EntityFrameworkCore` dependencies.
- Removed outdated `UserManager` dependencies.

Enhanced `Program.cs`:
- Integrated `EnvelopeGenerator` services with database context and caching configuration.
- Removed `AddUserManager` service registration.
- Added SQL Server logging and error handling for `DbContext`.

These changes improve maintainability, adopt modern frameworks, and introduce new functionality with `EnvelopeGenerator`.

src/DigitalData.Auth.API/Controllers/AuthController.cs

@@ -4,13 +4,13 @@ using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Options;
 using DigitalData.UserManager.Application.Contracts;
 using DigitalData.UserManager.Application.DTOs.User;
-using DigitalData.Core.Abstractions.Application;
 using DigitalData.Auth.API.Models;
 using DigitalData.Auth.API.Services.Contracts;
 using DigitalData.Auth.API.Entities;
-using DigitalData.Core.DTO;
 using DigitalData.Core.Abstractions.Security.Services;
 using DigitalData.Core.Abstractions.Security.Extensions;
+using DigitalData.Core.Abstraction.Application;
+using DigitalData.Core.Abstraction.Application.DTO;
 
 namespace DigitalData.Auth.API.Controllers
 {