Use a Manual vs ManualRecord in CliManualDeleter#user_must_confirm
Use a Manual vs ManualRecord in CliManualDeleter#user_must_confirm

This means we can use a higher-level of abstraction. Ideally
`ManualRecord` should be an implementation detail of `Manual`.

alphagov/manuals-publisher,alphagov/manuals-publisher,alphagov/manuals-publisher