[MC-143766] Loot tables cannot be applied to barrels

When applying loot tables to containers, the contents of barrels cannot be modified.

Apply a /data merge command to a barrel to give it a loot table
```
/data merge block ~ ~-1 ~ {LootTable:"minecraft:chests/buried_treasure"}
```
→ ❌ Contents will not be altered
Try using the /setblock command
```
/setblock ~ ~ ~ minecraft:barrel{LootTable:"minecraft:chests/buried_treasure"}
```
→ ❌ The barrel will not have the loot table contents

All commands used worked properly on chests and shulker boxes but not barrels.

Linked issues

Confirmed, Barrels don't have the LootTable and LootTableSeed NBT stored at all, meaning they can't be applied.

Same for smokers, blast furnaces (since furnaces can hold loot tables), and brewing stands (they can naturally generate in villages and igloos)

(since furnaces can hold loot tables)

Did you mean "can
't"?

I remembered them being able to have loot tabled, but I seem to have mis-remembered this.