Allow the housekeeping tasks to be scheduled instead of executed on push

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Description

We have several big repositories that get quite a lot of commits during the day, since the housekeeping lock the repository and are cpu intensive they can cause disruptions

Proposal

Run the housekeeping tasks with cron so the user could schedule them to runn in out-of-office hours. There already is gitlab-ce#15021 which is similar however instead of disabling housekeeping for the project I'd rather just have it run when I don't need the repo.