Eigenstasium can no longer create Eigenlockers, but adds rare maint Eigenlockers as a replacement (#94683)

## About The Pull Request

1. Eigenstasium can no longer be splashed onto lockers to link them
2. Maintenance lockers can rarely be linked to another locker on the
station - any locker, including head of staff lockers. This has a 0.1%
chance, which amounts to a ~5% chance to spawn on a map with 50 lockers.
3. Teleporting via an eigenlocker no longer opens up the opposite side,
allowing you to jumpscare people

## Why It's Good For The Game

1a. Eigenstasium's lockers are both significantly easier to produce and
significantly easier to use than our "intended" method of spot-to-spot
teleportation, the Quantum Pad.

There is an argument to be made in that the Quantum Pad needs to be
brought up to this level, and I may do that, because honestly, it's a
valid point. But in the meanwhile, it doesn't really make sense that
Chemistry can make better teleportation... than the teleportation
department.

1b. Eigenstasium wears too many hats. It really is a wonder chem. It
intrudes on other mechanics of other jobs and frankly doesn't need the
extra sauce, it's already interesting enough.

If your wikibox has a *collapsible*, it might be doing too much.... 

<img width="1567" height="397" alt="image"
src="https://github.com/user-attachments/assets/969b6d32-5e85-42a1-8d3b-7769b6968b95"
/>

2. However, teleporting lockers are funny. We have the station trait,
but it announces itself and affects (potentially) every closet, which
ruins some of the mystique. So I wanted to add that effect as something
you can stumble upon in the wild accidentally - Imagine hopping into a
locker in maint to dodge sec and you end up in the Captain's office.

3. Builds off of 2. Finding a locker that teleports you into the middle
of security so you can jump out and surprise them the next time they
show up sounds really funny.

## Changelog

🆑 Melbert
del: Eigenstasium can no longer create Eigenlockers
add: Rarely, maintenance lockers will spawn as Eigenlockers, potentially
linked to any other locker on the station - yes, even the Captain's.
add: Teleporting via an Eigenlocker doesn't auto-open the destination
locker, allowing you to hide in them.
/🆑

code/modules/reagents/chemistry/reagents/unique/eigenstasium.dm

@@ -107,15 +107,3 @@
 	do_sparks(5, FALSE, living_mob)
 
 //FOR ADDICTION-LIKE EFFECTS, SEE datum/status_effect/eigenstasium
-
-///Lets you link lockers together
-/datum/reagent/eigenstate/expose_turf(turf/exposed_turf, reac_volume)
-	. = ..()
-	if(creation_purity < 0.8)
-		return
-	var/list/lockers = list()
-	for(var/obj/structure/closet/closet in exposed_turf.contents)
-		lockers += closet
-	if(!lockers.len)
-		return
-	GLOB.eigenstate_manager.create_new_link(lockers, subtle = FALSE)