Sentience balloon can now assign antag to affected mobs (#83322)

## About The Pull Request

![изображение](https://github.com/tgstation/tgstation/assets/53361823/732725fe-7c87-48dd-a0d0-bab990e54cef)

![изображение](https://github.com/tgstation/tgstation/assets/53361823/4b78a0ae-05e2-40ea-9f48-574fb9ba1140)

there's probably a better way to show the list of antags
## Why It's Good For The Game
I wanna give out antag datum to things I spawn, doing it one by one is
annoying
## Changelog
🆑
admin: sentience balloon can now assign antag to affected mobs
/🆑

code/modules/admin/fun_balloon.dm

@@ -38,6 +38,8 @@
 	desc = "When this pops, things are gonna get more aware around here."
 	var/group_name = "a bunch of giant spiders"
 	var/effect_range = 3
+	var/antag_type = null
+	var/make_antag = FALSE
 
 /obj/effect/fun_balloon/sentience/ui_interact(mob/user, datum/tgui/ui)
 	ui = SStgui.try_update_ui(user, src, ui)
@@ -49,6 +51,7 @@
 	var/list/data = list()
 	data["group_name"] = group_name
 	data["range"] = effect_range
+	data["antag"] = make_antag
 	return data
 
 /obj/effect/fun_balloon/sentience/ui_state(mob/user)
@@ -73,6 +76,11 @@
 		if("effect_range")
 			effect_range = params["updated_range"]
 
+		if("select_antag")
+			var/list/paths = subtypesof(/datum/antagonist)
+			antag_type = input(usr,"Select antag", "Antagonist selection") as null|anything in sort_list(paths)
+			make_antag = TRUE
+
 		if("pop")
 			if(!popped)
 				popped = TRUE
@@ -105,6 +113,9 @@
 		message_admins("[key_name_admin(C)] has taken control of ([key_name_admin(body)])")
 		body.ghostize(FALSE)
 		body.key = C.key
+		if (make_antag)
+			body.mind.add_antag_datum(antag_type)
+			continue
 		new /obj/effect/temp_visual/gravpush(get_turf(body))
 
 // ----------- Emergency Shuttle Balloon