Machine's correctly eject signaller's attached to it's wires (#75928)

## About The Pull Request

Fixes #72053
the signaller is made part of the machine's `component_parts` now so it
doesn't get moved out when `dump_inventory_contents()` is called like in
the case of microwave when it has finished cooking
This fix also applies for other machine's that call this proc

Fixes #72132
Clear's out the `holder` & `connected` vars from the signaller when the
wire's get destroyed allowing the signaller to be picked up

## Changelog
:cl:
fix: microwave's(after it has finished cooking) & other machine's that
spit out contents don't spit out assemblies/signallers attached to it's
wires.
fix: signallers can be picked up if you attached them to a machine's
wire & later deconstructed that machine without detaching it first.
/:cl:

---------

Co-authored-by: Jeremiah <[email protected]>

code/datums/wires/_wires.dm

@@ -64,7 +64,12 @@
 
 /datum/wires/Destroy()
 	holder = null
-	assemblies = list()
+	//properly clear refs to avoid harddels & other problems
+	for(var/color in assemblies)
+		var/obj/item/assembly/assembly = assemblies[color]
+		assembly.holder = null
+		assembly.connected = null
+	LAZYCLEARLIST(assemblies)
 	return ..()
 
 /datum/wires/proc/add_duds(duds)
@@ -186,6 +191,14 @@
 	if(S && istype(S) && S.attachable && !is_attached(color))
 		assemblies[color] = S
 		S.forceMove(holder)
+		/**
+		 * special snowflake check for machines
+		 * someone attached a signaler to the machines wires
+		 * move it to the machines component parts so it doesn't get moved out in dump_inventory_contents() which gets called a lot
+		 */
+		if(istype(holder, /obj/machinery))
+			var/obj/machinery/machine = holder
+			LAZYADD(machine.component_parts, S)
 		S.connected = src
 		S.on_attach() // Notify assembly that it is attached
 		return S
@@ -195,7 +208,6 @@
 	if(S && istype(S))
 		assemblies -= color
 		S.on_detach()		// Notify the assembly.  This should remove the reference to our holder
-		S.forceMove(holder.drop_location())
 		return S
 
 /// Called from [/atom/proc/emp_act]