Refactors Regenerate Organs, and a few organ helpers (#74219)

## About The Pull Request

Refactors regenerate organs to be slightly more intelligent in handling
organ changes and replacements.
Noteably:
- We don't remove organs that were modified by the owner; such as
changing out your heart for a cybernetic
- We early break out of the for loop if they aren't supposed to have an
organ there and remove it
- We check for the organ already being correct, and just healing it and
continuing if it is

Also changes the names of some of the organ helpers into snake_case
### Mapping March
Ckey to receive rewards: N/A

## Why It's Good For The Game
## Changelog

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>

code/modules/wiremod/shell/brain_computer_interface.dm

@@ -436,7 +436,7 @@
 
 	playsound(loc, 'sound/machines/ping.ogg', 30, FALSE)
 
-	var/obj/item/organ/internal/cyberimp/bci/bci_organ = carbon_occupant.getorgan(/obj/item/organ/internal/cyberimp/bci)
+	var/obj/item/organ/internal/cyberimp/bci/bci_organ = carbon_occupant.get_organ_by_type(/obj/item/organ/internal/cyberimp/bci)
 
 	if (bci_organ)
 		bci_organ.Remove(carbon_occupant)
@@ -468,7 +468,7 @@
 
 	var/mob/living/carbon/carbon_occupant = occupant
 	if (istype(occupant))
-		var/obj/item/organ/internal/cyberimp/bci/bci_organ = carbon_occupant.getorgan(/obj/item/organ/internal/cyberimp/bci)
+		var/obj/item/organ/internal/cyberimp/bci/bci_organ = carbon_occupant.get_organ_by_type(/obj/item/organ/internal/cyberimp/bci)
 		if (isnull(bci_organ) && isnull(bci_to_implant))
 			say("No brain-computer interface inserted, and occupant does not have one. Insert a BCI to implant one.")
 			playsound(src, 'sound/machines/buzz-sigh.ogg', 30, TRUE)