Changed exceptions, added action for closing applications by applicant

SchengenVisaApi/Infrastructure/Database/VisaApplications/Repositories/Exceptions/ApplicationNotFoundByApplicantAndApplicationIdException.cs

@@ -0,0 +1,7 @@
+using ApplicationLayer.Services.GeneralExceptions;
+
+namespace Infrastructure.Database.VisaApplications.Repositories.Exceptions
+{
+    public class ApplicationNotFoundByApplicantAndApplicationIdException(Guid applicationId)
+        : EntityNotFoundException($"Application with id {applicationId} not found for authenticated user");
+}