ai controllers that fail to make a plan no longer process until theyre able to plan again (#86600)

## About The Pull Request
ai controllers that fail planning no longer process until theyre able to
plan again. this makes it so /process is called less thus you'll have
less AI competing against one another for cpu. also converts idle
behaviors into singletons

## Why It's Good For The Game
AIs that dont have a plan dont do anything during processing so its
better to just make them sit out the cycle instead of draining cpu

## Changelog
🆑
/🆑

code/controllers/subsystem/processing/ai_idle_behaviors.dm

@@ -1,6 +1,17 @@
 PROCESSING_SUBSYSTEM_DEF(idle_ai_behaviors)
-	name = "idle_ai_behaviors"
-	flags = SS_NO_INIT | SS_BACKGROUND
+	name = "AI Idle Behaviors"
+	flags = SS_BACKGROUND
 	wait = 1.5 SECONDS
 	priority = FIRE_PRIORITY_IDLE_NPC
 	init_order = INIT_ORDER_AI_IDLE_CONTROLLERS //must execute only after ai behaviors are initialized
+	///List of all the idle ai behaviors
+	var/list/idle_behaviors = list()
+
+/datum/controller/subsystem/processing/idle_ai_behaviors/Initialize()
+	setup_idle_behaviors()
+	return SS_INIT_SUCCESS
+
+/datum/controller/subsystem/processing/idle_ai_behaviors/proc/setup_idle_behaviors()
+	for(var/behavior_type in subtypesof(/datum/idle_behavior))
+		var/datum/idle_behavior/behavior = new behavior_type
+		idle_behaviors[behavior_type] = behavior