Rely on Jenkins to default to migrate state.
Rely on Jenkins to default to migrate state.

This reverts the earlier change that always just ran a migration. We can
implement this more cleanly by changing the Jenkins job.

Also, re-adds the 'reset' state, even though it won't work in staging or
production.

ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff