### 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)

ClassDB::bind_method(D_METHOD("get_terrains_count", "terrain_set"), &TileSet::get_terrains_count);
	ClassDB::bind_method(D_METHOD("add_terrain", "terrain_set", "to_position"), &TileSet::add_terrain, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("move_terrain", "terrain_set", "terrain_index", "to_position"), &TileSet::move_terrain);
	ClassDB::bind_method(D_METHOD("remove_terrain", "terrain_set", "terrain_index"), &TileSet::remove_terrain);
	ClassDB::bind_method(D_METHOD("set_terrain_name", "terrain_set", "terrain_index", "name"), &TileSet::set_terrain_name);
	ClassDB::bind_method(D_METHOD("get_terrain_name", "terrain_set", "terrain_index"), &TileSet::get_terrain_name);
	ClassDB::bind_method(D_METHOD("set_terrain_color", "terrain_set", "terrain_index", "color"), &TileSet::set_terrain_color);
	ClassDB::bind_method(D_METHOD("get_terrain_color", "terrain_set", "terrain_index"), &TileSet::get_terrain_color);
	
	ClassDB::bind_method(D_METHOD("get_navigation_layers_count"), &TileSet::get_navigation_layers_count);
	ClassDB::bind_method(D_METHOD("add_navigation_layer", "to_position"), &TileSet::add_navigation_layer, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("move_navigation_layer", "layer_index", "to_position"), &TileSet::move_navigation_layer);
	ClassDB::bind_method(D_METHOD("remove_navigation_layer", "layer_index"), &TileSet::remove_navigation_layer);
	ClassDB::bind_method(D_METHOD("set_navigation_layer_layers", "layer_index", "layers"), &TileSet::set_navigation_layer_layers);
	ClassDB::bind_method(D_METHOD("get_navigation_layer_layers", "layer_index"), &TileSet::get_navigation_layer_layers);
	ClassDB::bind_method(D_METHOD("set_navigation_layer_layer_value", "layer_index", "layer_number", "value"), &TileSet::set_navigation_layer_layer_value);
	ClassDB::bind_method(D_METHOD("get_navigation_layer_layer_value", "layer_index", "layer_number"), &TileSet::get_navigation_layer_layer_value);
	
	ClassDB::bind_method(D_METHOD("get_custom_data_layers_count"), &TileSet::get_custom_data_layers_count);
	ClassDB::bind_method(D_METHOD("add_custom_data_layer", "to_position"), &TileSet::add_custom_data_layer, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("move_custom_data_layer", "layer_index", "to_position"), &TileSet::move_custom_data_layer);
	ClassDB::bind_method(D_METHOD("remove_custom_data_layer", "layer_index"), &TileSet::remove_custom_data_layer);
	ClassDB::bind_method(D_METHOD("get_custom_data_layer_by_name", "layer_name"), &TileSet::get_custom_data_layer_by_name);
	ClassDB::bind_method(D_METHOD("set_custom_data_layer_name", "layer_index", "layer_name"), &TileSet::set_custom_data_layer_name);
	ClassDB::bind_method(D_METHOD("get_custom_data_layer_name", "layer_index"), &TileSet::get_custom_data_layer_name);
	ClassDB::bind_method(D_METHOD("set_custom_data_layer_type", "layer_index", "layer_type"), &TileSet::set_custom_data_layer_type);
	ClassDB::bind_method(D_METHOD("get_custom_data_layer_type", "layer_index"), &TileSet::get_custom_data_layer_type);
	
	ClassDB::bind_method(D_METHOD("set_source_level_tile_proxy", "source_from", "source_to"), &TileSet::set_source_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("get_source_level_tile_proxy", "source_from"), &TileSet::get_source_level_tile_proxy);