Revert "cleanup(gcf-utils): use Probot constructor instead of createProbot (#2066)" (#2087)
Revert "cleanup(gcf-utils): use Probot constructor instead of createProbot (#2066)" (#2087)

This reverts commit f8b533e4f2891f8012341444a7c5c403ee853a56.
googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots