Stop singularities from consuming themselves (#58987)

This bug was fixed by one of the connect_loc PRs, but this is still useful as it contains a CRASH for when it happens if this bug comes back again.

code/datums/components/singularity.dm

@@ -130,6 +130,10 @@
 	return COMPONENT_CANCEL_BLOB_ACT
 
 /datum/component/singularity/proc/consume(datum/source, atom/thing)
+	if (thing == parent)
+		stack_trace("Singularity tried to consume itself.")
+		return
+
 	consume_callback?.Invoke(thing, src)
 
 /datum/component/singularity/proc/consume_attack(datum/source, mob/user)

code/modules/power/singularity/singularity.dm

@@ -410,6 +410,7 @@
 /obj/singularity/singularity_act()
 	var/gain = (energy/2)
 	var/dist = max((current_size - 2),1)
+	investigate_log("has been destroyed by another singularity.", INVESTIGATE_SINGULO)
 	explosion(src, devastation_range = (dist), heavy_impact_range = (dist*2), light_impact_range = (dist*4))
 	qdel(src)
 	return gain