Merge branch 'sk/fix-rule-schedule-service' into 'master'

Fix Random.rand for zero values in RuleScheduleService

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175838



Merged-by: Andy Schoenen <asoiron@gitlab.com>
Approved-by: Andy Schoenen <asoiron@gitlab.com>
Reviewed-by: Andy Schoenen <asoiron@gitlab.com>
Co-authored-by: Sashi Kumar Kumaresan <skumar@gitlab.com>