Command blocks, structure blocks and jigsaw blocks use menu_background.png

Discovered while testing MC-268943.

The bug

The user interface for command blocks, structure blocks and jigsaw blocks uses the file menu_background.png, which is inconsistent with all other blocks with a user interface.

Ideally, they should use a texture file for the background instead of being hardcoded (MC-268927), however not the same one as for game menus.

How to reproduce

1. Download and apply the attached resource pack

2. Open the Game Menu

3. Open a chest or your inventory

4. Open a command block, structure block or jigsaw block UI

How to fix

Introduce a new texture file, inventory_background.png, which is used for the background texture in the user interface of command blocks, structure blocks and jigsaw blocks, as well as for any block or entity with an inventory.