Fix View Service History and View Notification Issue

- Updated sendNotification in InventoryManagementService, PaymentManagementService, and ServiceManagementService to use only the provided title instead of prefixing with service name.
- Added "View Service History" header in CustomerMenu::viewServiceHistory for clarity.
- Adjusted column widths in service history table for better alignment:
  - Booking ID column widened to 15.
  - Vehicle Brand, Vehicle Number, Vehicle Model, Discount %, and Status columns widened to 20.
- Updated output formatting in CustomerMenu::viewServiceHistory to match new widths.
- Added "View and Delete Notification" header in MenuHelper::viewAndDeleteNotification for clarity.
- Moved empty notification validation from selectNotification to viewAndDeleteNotification:
  - Displays "No notifications available." message.
  - Added util::pressEnter() prompt before returning when no notifications exist.
- Increased Notification title column width from 30 to 35 in selectNotification for improved readability.

Fixes #1748

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/InventoryManagementService.cpp

@@ -323,7 +323,7 @@ void InventoryManagementService::sendNotification(User* user, const std::string&
 				Factory::getObject<Notification>(
 					user->getId(),
 					user,
-					"InventoryManagementService: " + title,
+					title,
 					message,
 					util::Timestamp()
 				);

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/PaymentManagementService.cpp

@@ -86,7 +86,7 @@ void PaymentManagementService::sendNotification(User* user, const std::string& t
 				Factory::getObject<Notification>(
 					user->getId(),
 					user,
-					"PaymentManagementService: " + title,
+					title,
 					message,
 					util::Timestamp()
 				);

Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.cpp

@@ -175,7 +175,7 @@ void ServiceManagementService::sendNotification(User* user, const std::string& t
 				Factory::getObject<Notification>(
 					user->getId(),
 					user,
-					"ServiceManagementService: " + title,
+					title,
 					message,
 					util::Timestamp()
 				);