say NO to try-catch in controllers

- added ExceptionsMiddleware.cs
- added more Exception types
- removed all exceptions logic in controllers

SurveyBackend/SurveyBackend.Services/Services/UserService.cs

@@ -1,6 +1,7 @@
 using SurveyBackend.Core.Models;
 using SurveyBackend.Core.Repositories;
 using SurveyBackend.Core.Services;
+using SurveyBackend.Services.Exceptions;
 
 namespace SurveyBackend.Services.Services;
 
@@ -13,9 +14,9 @@ public class UserService : IUserService
         _userRepository = userRepository;
     }
 
-    public async Task<User?> GetUserByEmail(string email)
+    public async Task<User> GetUserByEmail(string email)
     {
-        return await _userRepository.GetUserByEmail(email);
+        return await _userRepository.GetUserByEmail(email) ?? throw new NotFoundException("Email not found");
     }
 
     public async Task CreateUserAsync(User user)