### 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)

ERR_FAIL_COND(p_atlas_coords.x < 0 || p_atlas_coords.y < 0);
	ERR_FAIL_COND(p_size.x <= 0 || p_size.y <= 0);
	bool room_for_tile = has_room_for_tile(p_atlas_coords, p_size, 1, Vector2i(), 1);
	ERR_FAIL_COND_MSG(!room_for_tile, "Cannot create tile. The tile is outside the texture or tiles are already present in the space the tile would cover.");
	
	TileAlternativesData tad;
	tad.size_in_atlas = p_size;
	tad.animation_frames_durations.push_back(1.0);
	tad.alternatives[0] = memnew(TileData);
	tad.alternatives[0]->set_tile_set(tile_set);
	tad.alternatives[0]->set_allow_transform(false);
	tad.alternatives[0]->connect("changed", callable_mp((Resource *)this, &TileSetAtlasSource::emit_changed));
	tad.alternatives[0]->notify_property_list_changed();
	tad.alternatives_ids.push_back(0);
	
	tiles.insert(p_atlas_coords, tad);
	tiles_ids.push_back(p_atlas_coords);
	tiles_ids.sort();
	_create_coords_mapping_cache(p_atlas_coords);
	_queue_update_padded_texture();
	emit_signal(SNAME("changed"));
}
void TileSetAtlasSource::remove_tile(Vector2i p_atlas_coords) {