feat(userAgent): allow for optional user agent to be provided (#1313)
feat(userAgent): allow for optional user agent to be provided (#1313)

Co-authored-by: Frank Natividad <42c65f5cb019546ce7eae9c91d2396d93d95c1d3@users.noreply.github.com>
googleapis/nodejs-storage,googleapis/nodejs-storage,googleapis/nodejs-storage,googleapis/nodejs-storage