chore(ckbtc): remove distribute_kyt_fee and reimburse_failed_kyt

[ninegua]

XC-237

Since the ckBTC minter switched to using the checker canister, it no longer needs to distribute kyt fees, or reimburse failed kyt. These calls can be removed from the code, but we do still need to keep them for event and state handling during replay.

[lpahlavi]

Just a small nit: could we deprecate the DistributedKytFee event?

[gregorydemay]

Thanks @ninegua for this PR! I have the impression we can delete more code 😄

[ninegua]

Just a small nit: could we deprecate the DistributedKytFee event?

I believe this event type is part of the historical events, which are still used during an event playback (e.g, when upgrading the minter). So the code handling them will need to be kept around.

[lpahlavi]

Just a small nit: could we deprecate the DistributedKytFee event?

I believe this event type is part of the historical events, which are still used during an event playback (e.g, when upgrading the minter). So the code handling them will need to be kept around.

Ah yes, I read this too quickly. I thought I remembered that the code replaying events allowed the use of deprecated events for backwards compatibility. Thanks for the clarification!