### 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)

if (p_name == "tile_data") {
		r_ret = _get_tile_data();
		return true;
	}
	return false;
}
void TileMapPattern::_get_property_list(List<PropertyInfo> *p_list) const {
	p_list->push_back(PropertyInfo(Variant::OBJECT, "tile_data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL));
}
void TileMapPattern::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_cell", "coords", "source_id", "atlas_coords", "alternative_tile"), &TileMapPattern::set_cell, DEFVAL(TileSet::INVALID_SOURCE), DEFVAL(TileSetSource::INVALID_ATLAS_COORDS), DEFVAL(TileSetSource::INVALID_TILE_ALTERNATIVE));
	ClassDB::bind_method(D_METHOD("has_cell", "coords"), &TileMapPattern::has_cell);
	ClassDB::bind_method(D_METHOD("remove_cell", "coords", "update_size"), &TileMapPattern::remove_cell);
	ClassDB::bind_method(D_METHOD("get_cell_source_id", "coords"), &TileMapPattern::get_cell_source_id);
	ClassDB::bind_method(D_METHOD("get_cell_atlas_coords", "coords"), &TileMapPattern::get_cell_atlas_coords);
	ClassDB::bind_method(D_METHOD("get_cell_alternative_tile", "coords"), &TileMapPattern::get_cell_alternative_tile);
	ClassDB::bind_method(D_METHOD("get_used_cells"), &TileMapPattern::get_used_cells);
	ClassDB::bind_method(D_METHOD("get_size"), &TileMapPattern::get_size);
	ClassDB::bind_method(D_METHOD("set_size", "size"), &TileMapPattern::set_size);
	ClassDB::bind_method(D_METHOD("is_empty"), &TileMapPattern::is_empty);
}
bool TileSet::TerrainsPattern::is_valid() const {
	return valid;
}
bool TileSet::TerrainsPattern::is_erase_pattern() const {
	return not_empty_terrains_count == 0;
}
bool TileSet::TerrainsPattern::operator<(const TerrainsPattern &p_terrains_pattern) const {