Changes

chore(prow-jobs/pingcap-qe/ci): update periodic-crawl-commits job schedule and config

- Change cron schedule to run every hour
- Reduce timeout to 1 hour
- Update path to path_alias for extra_refs
- Limit CRAWL_ORGS to 'pingcap'
- Add timeout command to crawl script
 (commit: d44115c)