updateIgnoreFiles function
Updates .gitignore and .pubignore files to include assetx.lock if not already present
Implementation
Future<void> updateIgnoreFiles({String? directory}) async {
final dir = directory ?? Directory.current.path;
await _updateIgnoreFile(filePath: '$dir/.gitignore', fileName: '.gitignore');
await _updateIgnoreFile(filePath: '$dir/.pubignore', fileName: '.pubignore');
}