[MIRROR] Adds IS_TRAITOR macro [MDB IGNORE] (#20153)

* Adds IS_TRAITOR macro (#74293)

## About The Pull Request
i was making another PR and found that we have cultist, heretic, and
nuke op IS macros but not one for traitors
this adds one and then replaces it where applicable, mostly in checks
where a traitor device does something different if you are not a traitor

## Why It's Good For The Game

better for people making traitor only devices to have this macro, as it
is more clear and also cleaner in general i think

## Changelog

🆑
code: adds IS_TRAITOR macro
/🆑

* Adds IS_TRAITOR macro

---------

Co-authored-by: Sol N <116288367+flowercuco@users.noreply.github.com>

code/game/objects/items/AI_modules/hacked.dm

@@ -44,7 +44,7 @@
 	var/functional = TRUE
 
 /obj/item/ai_module/malf/transmitInstructions(datum/ai_laws/law_datum, mob/sender, overflow)
-	if(!sender.mind?.has_antag_datum(/datum/antagonist/traitor))
+	if(!IS_TRAITOR(sender))
 		to_chat(sender, span_warning("You have no clue how to use this thing."))
 		return
 	if(!functional)