Return one notification per user, giving priority based on notification types

[vingkan]

Given a list of notification data, return a new list of notification data that has only one notification per user.

If you encounter multiple notifications for the same user, keep the notification that has the higher priority in this list of notification types.

1. Check Message
2. Rate Match
3. Edit Profile
4. Check Match

If two notifications for the same user have the same type, keep the one that came first in the list order.

Input: List of NotificationInfo
Output: List of NotificationInfo

Create a new function in the existing file pipeline/utils/notifications.py for your implementation and add tests for it in the corresponding test file.