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/forensics/_forensics.dm

@@ -73,29 +73,39 @@
 
 /// Empties the fingerprints list
 /datum/forensics/proc/wipe_fingerprints()
+	if(isnull(fingerprints))
+		return NONE
+
 	fingerprints = null
-	return TRUE
+	return COMPONENT_CLEANED
 
 /// Empties the blood_DNA list
 /datum/forensics/proc/wipe_blood_DNA()
+	if(isnull(blood_DNA))
+		return NONE
+
 	blood_DNA = null
-	return TRUE
+	return COMPONENT_CLEANED
 
 /// Empties the fibers list
 /datum/forensics/proc/wipe_fibers()
+	if(isnull(fibers))
+		return NONE
+
 	fibers = null
-	return TRUE
+	return COMPONENT_CLEANED
 
 /// Handles cleaning up the various forensic types
 /datum/forensics/proc/clean_act(datum/source, clean_types)
 	SIGNAL_HANDLER
 
+	. = NONE
 	if(clean_types & CLEAN_TYPE_FINGERPRINTS)
-		wipe_fingerprints()
+		. |= wipe_fingerprints()
 	if(clean_types & CLEAN_TYPE_BLOOD)
-		wipe_blood_DNA()
+		. |= wipe_blood_DNA()
 	if(clean_types & CLEAN_TYPE_FIBERS)
-		wipe_fibers()
+		. |= wipe_fibers()
 
 /// Adds the given list into fingerprints
 /datum/forensics/proc/add_fingerprint_list(list/fingerprints)