### 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)

create_tile(coords);
		}
		if (components.size() >= 2) {
			
			if (components[1] == "size_in_atlas") {
				move_tile_in_atlas(coords, coords, p_value);
				return true;
			} else if (components[1] == "next_alternative_id") {
				tiles[coords].next_alternative_id = p_value;
				return true;
			} else if (components[1] == "animation_columns") {
				set_tile_animation_columns(coords, p_value);
				return true;
			} else if (components[1] == "animation_separation") {
				set_tile_animation_separation(coords, p_value);
				return true;
			} else if (components[1] == "animation_speed") {
				set_tile_animation_speed(coords, p_value);
				return true;
			} else if (components[1] == "animation_frames_count") {
				set_tile_animation_frames_count(coords, p_value);
				return true;
			} else if (components.size() >= 3 && components[1].begins_with("animation_frame_") && components[1].trim_prefix("animation_frame_").is_valid_int()) {
				int frame = components[1].trim_prefix("animation_frame_").to_int();
				if (components[2] == "duration") {
					if (frame >= get_tile_animation_frames_count(coords)) {
						set_tile_animation_frames_count(coords, frame + 1);
					}
					set_tile_animation_frame_duration(coords, frame, p_value);
					return true;