### 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)

double picked = Math::random(0.0, sum);
	
	for (const TileMapCell &E : set) {
		if (E.source_id >= 0) {
			Ref<TileSetSource> source = sources[E.source_id];
			Ref<TileSetAtlasSource> atlas_source = source;
			if (atlas_source.is_valid()) {
				TileData *tile_data = atlas_source->get_tile_data(E.get_atlas_coords(), E.alternative_tile);
				count += tile_data->get_probability();
			} else {
				count += 1.0;
			}
		} else {
			count += 1.0;
		}
		if (count >= picked) {
			return E;
		}
	}
	ERR_FAIL_V(TileMapCell());
}
Vector<Vector2> TileSet::get_tile_shape_polygon() {
	Vector<Vector2> points;
	if (tile_shape == TileSet::TILE_SHAPE_SQUARE) {
		points.push_back(Vector2(-0.5, -0.5));
		points.push_back(Vector2(0.5, -0.5));
		points.push_back(Vector2(0.5, 0.5));
		points.push_back(Vector2(-0.5, 0.5));
	} else if (tile_shape == TileSet::TILE_SHAPE_ISOMETRIC) {
		points.push_back(Vector2(0.0, -0.5));