Make //drain command also remove bubble columns

### The Problem

The //drain command removes all water within a specific radius. However, it leaves `bubble_column` blocks, so if you try to drain an area where there are some magma blocks or soul sand on the floor, it won't be fully drained.

### A Solution

Make the //drain command also remove `bubble_column` blocks.

This would be useful for draining water-filled caves, as magma blocks can generate on the floor of water caves causing pillars of bubble column blocks to be left behind after using the drain command.

### Alternatives

_No response_

### Anything Else?

_No response_

Start at the //drain command entry point and inspect how it identifies water blocks within the requested radius. Add coverage for bubble_column blocks, including areas with magma blocks or soul sand, and verify that draining removes those columns as well as water.

Written by the indexing model from the issue text.