### 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)

Size2 size = get_tile_texture_region(p_atlas_coords).size;
	Rect2 rect = Rect2(-size / 2 - get_tile_data(p_atlas_coords, p_alternative_tile)->get_texture_origin(), size);
	return rect.has_point(p_position);
}
Ref<Texture2D> TileSetAtlasSource::get_runtime_texture() const {
	if (use_texture_padding) {
		return padded_texture;
	} else {
		return texture;
	}
}
Rect2i TileSetAtlasSource::get_runtime_tile_texture_region(Vector2i p_atlas_coords, int p_frame) const {
	ERR_FAIL_COND_V_MSG(!tiles.has(p_atlas_coords), Rect2i(), vformat("TileSetAtlasSource has no tile at %s.", String(p_atlas_coords)));
	ERR_FAIL_INDEX_V(p_frame, (int)tiles[p_atlas_coords].animation_frames_durations.size(), Rect2i());
	Rect2i src_rect = get_tile_texture_region(p_atlas_coords, p_frame);
	if (use_texture_padding) {
		const TileAlternativesData &tad = tiles[p_atlas_coords];
		Vector2i frame_coords = p_atlas_coords + (tad.size_in_atlas + tad.animation_separation) * ((tad.animation_columns > 0) ? Vector2i(p_frame % tad.animation_columns, p_frame / tad.animation_columns) : Vector2i(p_frame, 0));
		Vector2i base_pos = frame_coords * (texture_region_size + Vector2i(2, 2)) + Vector2i(1, 1);
		return Rect2i(base_pos, src_rect.size);
	} else {
		return src_rect;
	}
}
void TileSetAtlasSource::move_tile_in_atlas(Vector2i p_atlas_coords, Vector2i p_new_atlas_coords, Vector2i p_new_size) {