### 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("has_source_level_tile_proxy", "source_from"), &TileSet::has_source_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("remove_source_level_tile_proxy", "source_from"), &TileSet::remove_source_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("set_coords_level_tile_proxy", "p_source_from", "coords_from", "source_to", "coords_to"), &TileSet::set_coords_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("get_coords_level_tile_proxy", "source_from", "coords_from"), &TileSet::get_coords_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("has_coords_level_tile_proxy", "source_from", "coords_from"), &TileSet::has_coords_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("remove_coords_level_tile_proxy", "source_from", "coords_from"), &TileSet::remove_coords_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("set_alternative_level_tile_proxy", "source_from", "coords_from", "alternative_from", "source_to", "coords_to", "alternative_to"), &TileSet::set_alternative_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("get_alternative_level_tile_proxy", "source_from", "coords_from", "alternative_from"), &TileSet::get_alternative_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("has_alternative_level_tile_proxy", "source_from", "coords_from", "alternative_from"), &TileSet::has_alternative_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("remove_alternative_level_tile_proxy", "source_from", "coords_from", "alternative_from"), &TileSet::remove_alternative_level_tile_proxy);
	ClassDB::bind_method(D_METHOD("map_tile_proxy", "source_from", "coords_from", "alternative_from"), &TileSet::map_tile_proxy);
	ClassDB::bind_method(D_METHOD("cleanup_invalid_tile_proxies"), &TileSet::cleanup_invalid_tile_proxies);
	ClassDB::bind_method(D_METHOD("clear_tile_proxies"), &TileSet::clear_tile_proxies);
	
	ClassDB::bind_method(D_METHOD("add_pattern", "pattern", "index"), &TileSet::add_pattern, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("get_pattern", "index"), &TileSet::get_pattern, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("remove_pattern", "index"), &TileSet::remove_pattern);
	ClassDB::bind_method(D_METHOD("get_patterns_count"), &TileSet::get_patterns_count);
	ADD_GROUP("Rendering", "");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "uv_clipping"), "set_uv_clipping", "is_uv_clipping");
	ADD_ARRAY("occlusion_layers", "occlusion_layer_");
	ADD_GROUP("", "");
	ADD_ARRAY("physics_layers", "physics_layer_");
	ADD_ARRAY("terrain_sets", "terrain_set_");
	ADD_ARRAY("navigation_layers", "navigation_layer_");
	ADD_ARRAY("custom_data_layers", "custom_data_layer_");
	
	BIND_ENUM_CONSTANT(TILE_SHAPE_SQUARE);
	BIND_ENUM_CONSTANT(TILE_SHAPE_ISOMETRIC);
	BIND_ENUM_CONSTANT(TILE_SHAPE_HALF_OFFSET_SQUARE);