Spiders can now be tamed and ridden (#95194)

## About The Pull Request
This lets people ride and tame spiders by feeding them mouse, lizard,
moth, fly, and worm meat. You can only do this when a spider is a
spiderling or young; once it's fully grown, it's no longer possible.

This also refactors some tameable code to use `TRAIT_TAMED` instead of
setting variables on mobs individually.

## Why It's Good For The Game
It looks cool.

<img width="1920" height="1080" alt="dreamseeker_97k7fgzdhv"
src="https://github.com/user-attachments/assets/87d53102-468d-4dd7-b0a7-004f9a98df17"
/>


## Changelog
🆑
add: Spiders can now be tamed and ridden. They eat mouse, lizard, moth,
fly, and worm meat and can only be tamed when they are spiderlings or
young.
code: Refactored tameable code to use TRAIT_TAMED instead of setting
individual variables on each mob.
/🆑

code/modules/mob/living/basic/pets/dog/_dog.dm

@@ -91,6 +91,7 @@
 
 ///Proc to run on a successful taming attempt
 /mob/living/basic/pet/dog/tamed(mob/living/tamer, atom/food)
+	. = ..()
 	visible_message(span_notice("[src] licks at [tamer] in a friendly manner!"))
 
 /// A dog bone fully heals a dog, and befriends it if it's not your friend.

code/modules/mob/living/basic/pets/parrot/_parrot.dm

@@ -447,6 +447,7 @@ GLOBAL_LIST_INIT(strippable_parrot_items, create_strippable_list(list(
 	return returnable_list
 
 /mob/living/basic/parrot/tamed(mob/living/tamer, atom/food)
+	. = ..()
 	new /obj/effect/temp_visual/heart(drop_location())
 
 /mob/living/basic/parrot/proc/drop_item_on_signal(mob/living/user)