Numerous Mac users are repeatedly encountering a bug in macOS Ventura that throws up Login Items notifications for various background app processes every.
https://www.macrumors.com/2023/02/02/macos-background-items-added-notification-bug/
Check notification previews (but this does not stop the above popup): System Settings -> Notifications -> Show Previews
Seems like you cannot disable “System Settings -> General -> Login Items“
In Finder app, select Go -> Go to Folder… from the menu bar
Put the following address into the input field and press Enter: ~/Library/LaunchAgents and then (on my Mac the next does not exist) ~/Library/LaunchDaemons
For details read the above MacRumors article.