With changes to the payment domain, the comment finder now uses the deprecated getAmount method from the Donation Doctrine entity. Instead, it should use a raw database query, joining the payments table.

Acceptance criteria

• The CommentFinder class does not use deprecated methods any more

Implementation notes
The CommentFinder class already provides a "view model" (CommentWithAmount) that's detached from the actual database structure. Detach it more by using a raw DBAL query (using SQL or a query builder).

When the comments get factored out from donations into their own table, we can think of denormalizing the data a bit, adding the amount to the comment table to avoid a JOIN. But that's not part of this ticket.