### 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)

tile_data->set_z_index(ctd->autotile_z_index_map[coords]);
							}
							
							if (ctd->shapes.size() > 0) {
								if (get_physics_layers_count() < 1) {
									add_physics_layer();
								}
							}
							for (int k = 0; k < ctd->shapes.size(); k++) {
								CompatibilityShapeData csd = ctd->shapes[k];
								if (csd.autotile_coords == coords) {
									Ref<ConvexPolygonShape2D> convex_shape = csd.shape; 
									if (convex_shape.is_valid()) {
										Vector<Vector2> polygon = convex_shape->get_points();
										for (int point_index = 0; point_index < polygon.size(); point_index++) {
											polygon.write[point_index] = xform.xform(csd.transform.xform(polygon[point_index]) - ctd->autotile_tile_size / 2.0);
										}
										tile_data->set_collision_polygons_count(0, tile_data->get_collision_polygons_count(0) + 1);
										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);
									}
								}
							}