Tunes new antag mechanic behaviors (Greimorian Egg Clade, Radioactive Waste) (#21713)

changes:
- rscadd: "Spilled radium now generates (weakly) radioactive puddles of
green goo, just like Uranium."
  - balance: "Extends Greimorian eggsac incubation time by 50%."
- balance: "Introduces a probability element to greimorian egg toxin
metabolism; after being injected with the reagent, each metabolism tick
only has a % chance to create the eggsac 'organ', meaning quick
helmizole injection (or dumb luck) can prevent incubation entirely."
- balance: "Introduces clamp on spiderling generation counter to prevent
RNG from causing outsized impact from single eggsac rupture."
- balance: "If the randomly chosen body part a Greimorian eggsac would
infest is the head, the victim will get an extra reroll of target body
part to avoid the associated instant death risk."
- balance: "Consuming radioactive waste is now MUCH unhealthier. Don't
eat radioactive waste."
- qol: "Updates some antagonist tips (removed old/deprecated ones, added
new one.)"
- bugfix: "Removed greimorian eggsacs now dissolve into goo as
intended."

code/game/objects/effects/decals/Cleanable/misc.dm

@@ -61,7 +61,7 @@
 /obj/effect/decal/cleanable/greenglow/post_sweep(var/mob/user)
 	if(ishuman(user))
 		var/mob/living/carbon/human/H = user
-		H.apply_radiation(5)
+		H.apply_radiation(3)
 	STOP_PROCESSING(SSprocessing, src)
 
 ABSTRACT_TYPE(/obj/effect/decal/cleanable/greenglow/radioactive)