moves abstract_type up to datum, spawners wont spawn them (#92909)

## About The Pull Request
moves all implementations (im aware of) for "Im a parent type dont spawn
me please" to the datum layer to standardized behavior
adds a standerized proc for filtering out "bad" items that we dont want
spawning. applies to it the subtype vendor, gifts, and a new spawner and
mystery box for a random gun (neither playerfacing)
"port" of https://github.com/shiptest-ss13/Shiptest/pull/4621



https://github.com/user-attachments/assets/22f6f0b2-b44e-411a-b3dc-6b97dc0287aa

small warning: I dont have EVERY abstract type defined right now but,
ive done a good enough job for now. Im tired of data entry rn
## Why It's Good For The Game
standardizing behavior. Might be a micro hit to performance however

having this lets us not rely on icon state to determine whether
something is a parent type and makes it much easier to tell something is
a parent type (could be applied further to things like admin spawning
menus and things like that).

need feedback on if this is actually good for the game.
## Changelog
🆑
add: Soda cans show up in the silver slime drink table.
add: Examine tag for items that are not mean to show up ingame.
refactor: Standardizes how gifts rule out abstract types.
fix: gifts no longer check if something has an inhand, massively
expanding the list of potential items.
/🆑

code/modules/hydroponics/grown.dm

@@ -11,10 +11,11 @@
 
 // Base type. Subtypes are found in /grown dir. Lavaland-based subtypes can be found in mining/ash_flora.dm
 /obj/item/food/grown
+	name = "fresh produce" // so recipe text doesn't say 'snack'
 	icon = 'icons/obj/service/hydroponics/harvest.dmi'
 	icon_state = "berrypile"
 	worn_icon = 'icons/mob/clothing/head/hydroponics.dmi'
-	name = "fresh produce" // so recipe text doesn't say 'snack'
+	abstract_type = /obj/item/food/grown
 	max_volume = PLANT_REAGENT_VOLUME
 	w_class = WEIGHT_CLASS_SMALL
 	resistance_flags = FLAMMABLE

code/modules/hydroponics/grown/citrus.dm

@@ -1,11 +1,12 @@
 // Citrus - base type
 /obj/item/food/grown/citrus
-	seed = /obj/item/seeds/lime
 	name = "citrus"
 	desc = "It's so sour, your face will twist."
 	icon_state = "lime"
+	abstract_type = /obj/item/food/grown/citrus
 	foodtypes = FRUIT
 	wine_power = 30
+	seed = /obj/item/seeds/lime
 
 // Lime
 /obj/item/seeds/lime

code/modules/hydroponics/grown/mushrooms.dm

@@ -1,5 +1,6 @@
 /obj/item/food/grown/mushroom
 	name = "mushroom"
+	abstract_type = /obj/item/food/grown/mushroom
 	// This is a prototype that should never be spawned
 	// but we'll default it to SOME seed if it does end up spawning just so we don't runtime horribly
 	seed = /obj/item/seeds/chanter

code/modules/hydroponics/growninedible.dm

@@ -6,6 +6,7 @@
 	name = "grown_weapon"
 	icon = 'icons/obj/service/hydroponics/harvest.dmi'
 	worn_icon = 'icons/mob/clothing/head/hydroponics.dmi'
+	abstract_type = /obj/item/grown
 	resistance_flags = FLAMMABLE
 	var/obj/item/seeds/seed = null // type path, gets converted to item on New(). It's safe to assume it's always a seed item.
 	/// Should we pixel offset ourselves at init? for mapping
@@ -13,7 +14,7 @@
 	/// The reagent this plant distill to. If NULL, it uses a generic fruit_wine reagent and adjusts its variables.
 	var/distill_reagent
 
-// This may look like it's doing nothing but it's necessary, we do this to have kwargs work in New (for passing into Initialize)  
+// This may look like it's doing nothing but it's necessary, we do this to have kwargs work in New (for passing into Initialize)
 /obj/item/grown/New(loc, obj/item/seeds/new_seed)
 	return ..()
 

code/modules/hydroponics/seeds.dm

@@ -6,6 +6,7 @@
 	icon = 'icons/obj/service/hydroponics/seeds.dmi'
 	icon_state = "seed" // Unknown plant seed - these shouldn't exist in-game.
 	worn_icon_state = "seed"
+	abstract_type = /obj/item/seeds
 	w_class = WEIGHT_CLASS_TINY
 	resistance_flags = FLAMMABLE
 	/// Name of plant when planted.