### 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)

ERR_FAIL_COND(!scenes.has(p_id));
	if (p_packed_scene.is_valid()) {
		
		Ref<SceneState> scene_state = p_packed_scene->get_state();
		String type;
		while (scene_state.is_valid() && type.is_empty()) {
			
			ERR_FAIL_COND(scene_state->get_node_count() < 1);
			type = scene_state->get_node_type(0);
			scene_state = scene_state->get_base_scene_state();
		}
		ERR_FAIL_COND_MSG(type.is_empty(), vformat("Invalid PackedScene for TileSetScenesCollectionSource: %s. Could not get the type of the root node.", p_packed_scene->get_path()));
		bool extends_correct_class = ClassDB::is_parent_class(type, "CanvasItem");
		ERR_FAIL_COND_MSG(!extends_correct_class, vformat("Invalid PackedScene for TileSetScenesCollectionSource: %s. Root node should extend CanvasItem. Found %s instead.", p_packed_scene->get_path(), type));
		scenes[p_id].scene = p_packed_scene;
	} else {
		scenes[p_id].scene = Ref<PackedScene>();
	}
	emit_signal(SNAME("changed"));
}
Ref<PackedScene> TileSetScenesCollectionSource::get_scene_tile_scene(int p_id) const {