refactor: add get_scheduling_states_inner

[Luc-Mcgrady]

closes #5144

anki/rslib/src/scheduler/answering/mod.rs

Line 231 in fd65f20

let card = self.storage.get_card(cid)?.or_not_found(cid)?;

This call to the db is made even though the card is already fetched from the db by the function caller.