Adds a new brand of cigarettes, Mainthol Greys (#91328)

**We all like a little flavor, and a new brand in the sector promises a
dark smoke, questionable trace compounds, and the robust flavors of
maintenance...**

![paintdotnet_GC1kzxYiG0](https://github.com/user-attachments/assets/fb1c9986-7ce2-4ab4-a033-f4d2cf93b3c6)

## About The Pull Request
I've added a new brand of cigarettes! Mainthol greys, now available in
hacked cigarette vending machines for an immodest sum, hand rolled &
grown in the Sybil sector. The syndicate stock some stolen surplus too.
The goal was to create another nice little flavor item, a compliment to
grey bull and other maintenance loot.

<details>
<summary>Chemical contents in code, for the joy of discovery!</summary>

  ```
1u oculine is in every cigarette, an imperceptible buffer against the
welder harming an enterprising assistant's eyes.
Extremely trace amount for cigarette microdosing.
Each cigarette has a 40% chance to have an extra reagent from a list of
14 minor toxins, drugs, and things like glitter.
They're inconsequential via cigarette, but still noticed and
experienced.
  ```
</details>
I tested these bad boys extensively, blending them, ate them, blinded
myself with a welder, spammed a health analyzer while smoking to gauge
chemicals and ensure intended effects are noticed and add a nice je ne
sais quois.

**Our sprites!**

![image](https://github.com/user-attachments/assets/4a8c8e57-634b-4c29-ae03-ae8913040279)

## Why It's Good For The Game
It's an extra little flavor item with a couple simple surprises to spice
up your assisting.
## Changelog
🆑
add: Added a new brand of cigarettes to hacked & syndicate vending
machines+spawner list.
/🆑

---------

Co-authored-by: Tim <timothymtorres@gmail.com>
Co-authored-by: MrMelbert <51863163+MrMelbert@users.noreply.github.com>
Co-authored-by: san7890 <the@san7890.com>

code/game/objects/effects/spawners/random/entertainment.dm

@@ -151,6 +151,7 @@
 		/obj/item/storage/fancy/cigarettes/cigpack_robustgold = 1,
 		/obj/item/storage/fancy/cigarettes/cigpack_midori = 1,
 		/obj/item/storage/fancy/cigarettes/cigpack_candy = 1,
+		/obj/item/storage/fancy/cigarettes/cigpack_greytide = 1,
 	)
 
 /obj/effect/spawner/random/entertainment/cigarette
@@ -165,6 +166,7 @@
 		/obj/item/cigarette/robust = 2,
 		/obj/item/cigarette/carp = 1,
 		/obj/item/cigarette/robustgold = 1,
+		/obj/item/cigarette/greytide = 3,
 	)
 
 /obj/effect/spawner/random/entertainment/cigar