### 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)

Vector<String> components = String(p_name).split("/", true, 2);
	
	Vector<String> coords_split = components[0].split(":");
	if (coords_split.size() == 2 && coords_split[0].is_valid_int() && coords_split[1].is_valid_int()) {
		Vector2i coords = Vector2i(coords_split[0].to_int(), coords_split[1].to_int());
		if (tiles.has(coords)) {
			if (components.size() >= 2) {
				
				if (components[1] == "size_in_atlas") {
					r_ret = tiles[coords].size_in_atlas;
					return true;
				} else if (components[1] == "next_alternative_id") {
					r_ret = tiles[coords].next_alternative_id;
					return true;
				} else if (components[1] == "animation_columns") {
					r_ret = get_tile_animation_columns(coords);
					return true;
				} else if (components[1] == "animation_separation") {
					r_ret = get_tile_animation_separation(coords);
					return true;
				} else if (components[1] == "animation_speed") {
					r_ret = get_tile_animation_speed(coords);
					return true;
				} else if (components[1] == "animation_frames_count") {
					r_ret = get_tile_animation_frames_count(coords);
					return true;