During a previous refactor on project model, code related to the
hashed storage was extracted into AfterRenameService, see
4b9c17f1.

The "path_before" was changed from using `previous_changes['path']` to
`path_was`. They are not equivalent. `path_was` exists reliably only
*before* persisting to the database. After database persistence is
confirmed, the value is moved to `previous_changes[:attribute_name]`.

Because the repository/attachments rename or storage upgrade happens
after it was persisted to the database, we were in fact not informing
the right parameters (and therefore not doing what it was supposed to).