### 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)

int index = tile_data->get_collision_polygons_count(0) - 1;
								tile_data->set_collision_polygon_one_way(0, index, csd.one_way);
								tile_data->set_collision_polygon_one_way_margin(0, index, csd.one_way_margin);
								tile_data->set_collision_polygon_points(0, index, polygon);
							}
						}
					}
				}
				
				if (!compatibility_size_count.has(ctd->region.get_size())) {
					compatibility_size_count[ctd->region.get_size()] = 0;
				}
				compatibility_size_count[ctd->region.get_size()]++;
			} break;
			case COMPATIBILITY_TILE_MODE_AUTO_TILE: {
				
				WARN_PRINT_ONCE("Could not convert 3.x autotiles to 4.x. This operation cannot be done automatically, autotiles must be re-created using the terrain system.");
			} break;
			case COMPATIBILITY_TILE_MODE_ATLAS_TILE: {
				atlas_source->set_margins(ctd->region.get_position());
				atlas_source->set_separation(Vector2i(ctd->autotile_spacing, ctd->autotile_spacing));
				atlas_source->set_texture_region_size(ctd->autotile_tile_size);
				Size2i atlas_size = ctd->region.get_size() / (ctd->autotile_tile_size + atlas_source->get_separation());
				for (int i = 0; i < atlas_size.x; i++) {
					for (int j = 0; j < atlas_size.y; j++) {
						Vector2i coords = Vector2i(i, j);
						for (int flags = 0; flags < 8; flags++) {
							bool flip_h = flags & 1;
							bool flip_v = flags & 2;
							bool transpose = flags & 4;