### 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 (ctd->navigation.is_valid()) {
						if (get_navigation_layers_count() < 1) {
							add_navigation_layer();
						}
						Ref<NavigationPolygon> navigation = ctd->navigation->duplicate();
						Vector<Vector2> vertices = navigation->get_vertices();
						for (int index = 0; index < vertices.size(); index++) {
							vertices.write[index] = xform.xform(vertices[index] - ctd->region.get_size() / 2.0);
						}
						navigation->set_vertices(vertices);
						tile_data->set_navigation_polygon(0, navigation);
					}
					tile_data->set_z_index(ctd->z_index);
					
					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->region.get_size() / 2.0);
								}
								tile_data->set_collision_polygons_count(0, tile_data->get_collision_polygons_count(0) + 1);