Audits wash/cleaning signals + refactors wash() to ensure no needless mob updates occur (#91259)

## About The Pull Request

This has the potential to create a lot of needless mob updates which is
not great. Now should only update a mob's clothing if it was actually
washed.

This PR

1) ensures that all wash() procs return a bitflag.
2) ensures that `wash()` proccalls which result in expensive operations
like icon updates only do so when it is necessary

## Why It's Good For The Game

Updating mob sprites is expensive, and doing it when nothing has been
changed is bad.

## Changelog

Nothing really player facing

code/modules/mining/equipment/monster_organs/brimdust_sac.dm

@@ -137,8 +137,10 @@
 /// When you are cleaned, wash off the buff
 /datum/status_effect/stacking/brimdust_coating/proc/on_cleaned()
 	SIGNAL_HANDLER
-	owner.remove_status_effect(/datum/status_effect/stacking/brimdust_coating)
-	return COMPONENT_CLEANED
+
+	. = NONE
+	if(owner.remove_status_effect(/datum/status_effect/stacking/brimdust_coating))
+		. |= COMPONENT_CLEANED
 
 /// When you take brute damage, schedule an explosion
 /datum/status_effect/stacking/brimdust_coating/proc/on_take_damage(datum/source, damage, damagetype, ...)