Abstract out manager screen opening

[TeamDman]

before 1.20.4

            NetworkHooks.openScreen(serverPlayer, manager, buf -> ManagerContainerMenu.encode(manager, buf));

after 1.20.4

            serverPlayer.openMenu(manager, buf -> ManagerContainerMenu.encode(manager, buf));

we want them to be the same

should be able to update or use SFMScreenChangeHelpers