From the Nobara changelog: https://nobaraproject.org/category/changelog/

plasma-discover and gnome-software have both now been replaced with flatpost. Flatpost is a new in-house developed one-stop shop for flatpaks. It is able to handle installation, removal, upgrading, and permissions of flatpaks as well as flatpak repository management. You should find it provides all of the same permission toggles as flatseal. It is a simple application built on python and gtk, and is meant to be a desktop environment agnostic solution (meaning it should run in any DE). We did this because while we only support Gnome and KDE, we understand users still want to install their own environments and will do so regardless of whether or not it’s supported. If they are going to do that, again we prefer users to install flatpaks where possible for their software needs, and not all environments have a flatpak shop. For example if I’m using hyprland or labwc, now I have a shop I can use with them: https://github.com/GloriousEggroll/flatpost. Users can still manually install plasma-discover or gnome-software if they prefer.