Remove duplicate milks (#22721)

* Remove duplicate milks

* Migration

* Inventories

* Guidebook

---------

Co-authored-by: Jeff <velcroboy333@hotmail.com>

Resources/Textures/Objects/Consumable/Drinks/oatmilk.rsi/meta.json

@@ -0,0 +1 @@
+{"version": 1, "size": {"x": 32, "y": 32}, "license": "CC-BY-SA-3.0", "copyright": "https://github.com/discordia-space/CEV-Eris/raw/f7aa28fd4b4d0386c3393d829681ebca526f1d2d/icons/obj/drinks.dmi", "states": [{"name": "icon"}]}

Resources/Textures/Objects/Consumable/Food/ingredients.rsi/meta.json

@@ -67,15 +67,6 @@
     {
       "name": "mayo"
     },
-    {
-      "name": "milk"
-    },
-    {
-      "name": "milk-soy"
-    },
-    {
-      "name": "milk-oat"
-    },
     {
       "name": "oliveoil"
     },