[MC-193313] Mob item pick up behavior is not distinct resulting in mobs constantly dropping and picking up items

The bug

Mobs with CanPickUpLoot:1b do not have distinct rules for when to pick up items. Instead they constantly switch an undamaged item with a damaged item of the same type with additional NBT (e.g. enchantments, custom name, ...).

This is a clone of ~~MC-113131~~, however it appears there were some versions including 1.15.2 where mobs did not prefer items with NBT. This might have been fixed by ~~MC-174359~~.
The code analysis of ~~MC-113131~~ is likely still relevant.

Results on a survival: https://www.reddit.com/r/Minecraft/comments/iao4p3/i_just_finished_afking_at_my_new_gold_farm_when_i/

Example videos:

How to reproduce

Summon a mob which can pick up items
```
/summon husk ~ ~ ~ {CanPickUpLoot:1b}
```
Set the mobGriefing gamerule to true if it is not already
```
/gamerule mobGriefing true
```
Throw an undamaged chestplate at the mob
```
/give @p diamond_chestplate
```
Throw a damaged chestplate (with NBT) at the mob
```
/give @p diamond_chestplate{Enchantments:[{id:unbreaking,lvl:1s}],Damage:1}
```
→ The mob constantly swaps the items