You can still spawn them, it's just a little more complicated.
Load map from main menu with the map command (only way to get cheats).
sv_cheats 1
ent_create upgrade_laser_sight
ent_create upgrade_ammo_explosive
ent_create upgrade_ammo_incendiary
ent_create weapon_grenade_launcher
fireworks (new explosive exclusive to Dark Carnival):
prop_physics_create props_junk/explosive_box001.mdl