[1.21.3] Missing textures in model neoforge:bucket_milk#inventory:

[Lolothepro]

Minecraft Version: 1.21.3

NeoForge Version: 21.3.4-beta

Logs: https://mclo.gs/m9nrSbZ

Steps to Reproduce:

1. Load the game
2. Check the log file

Description of issue:

[Worker-Main-5/WARN] [minecraft/ModelManager]: Missing textures in model neoforge:bucket_milk#inventory:
    minecraft:textures/atlas/blocks.png:neoforge:items/bucket_base
    minecraft:textures/atlas/blocks.png:neoforge:items/bucket_cover
    minecraft:textures/atlas/blocks.png:neoforge:items/bucket_fluid

NeoForge causes this warning

[sciwhiz12]

The area around those model files for the milk buckets and dynamic buckets (as I understand it) needs quite a bit of attention for cleanup.

The textures originally refered from neoforge:bucket_milk are different from the mask textures now present in the assets folder; see https://github.com/neoforged/NeoForge/tree/4ea73399de818f3670a78a5afd5772a05a73221d/src/main/resources/assets/forge/textures/items for the original textures that the model referred to.

Some of these models also need some investigation: why do we duplicate item/generated and item/handheld as neoforge:item/default and neoforge:item/default-tool? Are these models even used at the moment?

The models ought to be moved to datageneration, with comments on why they exist as well for future reference.