deposit: Admin tool to reschedule deposits

As per the parent child #1693 (closed), we need a tool to ease the re-scheduling of deposits.

Impacts:

• (deposit model) keep the scheduling task identifier deposit side. (This is an information we can store at scheduling time. This in order to avoid any scheduler db lookup.)
• new admin cli endpoint in charge of rescheduling. This would orchestrate:
  • the db record change needed (state needs to be reset: status set to 'verified', swh_id(s) set to null)
  • effective task rescheduling (reusing the deposit's reference ids from the first point)

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Migrated from T1703 (view on Phabricator)