### Godot version

v4.0.3.stable.mono.official [5222a99f5]

### System information

macOS Monterey 12.6.6 (21G646)

### Issue description

When creating a tileset by code with custom data layers, removing a layer with `remove_custom_data_layer` does not update the name-to-layer mapping; `get_custom_data_layer_by_name` will continue to return that layer's original index.

This has a downstream effect of causing TileData objects attempting to use `get_custom_data('Layer B')` to return invalid data (whatever custom data is now in Layer B's old index; e.g. Layer C).

I would expect that after using `remove_custom_data_layer`, I would be able to still use `get_custom_data_layer_by_name` on that tileset.

### Steps to reproduce

Run this code to see that getting Layer B by name after removing the first layer continues to return its original index (1) when in reality it is now at index 0.
```
	var tileset:TileSet = TileSet.new()

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(0, 'Layer A')
	tileset.set_custom_data_layer_type(0, TYPE_INT)

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(1, 'Layer B')
	tileset.set_custom_data_layer_type(1, TYPE_STRING)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer A
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # Layer B
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # 1

	print('----- removing custom data layer 0 -----')
	tileset.remove_custom_data_layer(0)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer B
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # prints an error, as expected
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # returns 1 still! should return 0.
```

### Minimal reproduction project

[RemoveCustomDataLayer.zip](https://github.com/godotengine/godot/files/11804762/RemoveCustomDataLayer.zip)

}
					}
				}
				
				if (!compatibility_size_count.has(ctd->region.get_size())) {
					compatibility_size_count[ctd->autotile_tile_size] = 0;
				}
				compatibility_size_count[ctd->autotile_tile_size] += atlas_size.x * atlas_size.y;
			} break;
		}
		
		for (int k = 0; k < ctd->shapes.size(); k++) {
			Ref<ConvexPolygonShape2D> convex = ctd->shapes[k].shape;
			if (convex.is_valid()) {
				Vector<Vector2> points = convex->get_points();
				for (int i_point = 0; i_point < points.size(); i_point++) {
					points.write[i_point] = points[i_point] - get_tile_size() / 2;
				}
				convex->set_points(points);
			}
		}
	}
	
	Vector2i max_size = get_tile_size();
	int max_count = 0;
	for (KeyValue<Vector2i, int> kv : compatibility_size_count) {
		if (kv.value > max_count) {