[keyserver] Convert ids in rescinds

Summary:
ENG-4569

Rescinds also need to be converted. To do that we need to pass stateVersion in the delivery, alongside the codeVersion and using it convert the rescinds.

Test Plan:
Checked that notification were rescinded on macOS and Android, after displaying them on web app. Checked if the rescinded column in the notification table was set to 1, and a new rescind row was created.

Done this for both stateVersion < 43 (the ids aren't converted) and stateVersion >= 43 (the ids were converted).
Tested variant when the notification was sent to stateVersion < 43 but rescind was sent to stateVersion >= 43 (in this case I also checked if the group summary notification was removed).
Also tested if the notifications were rescinded if they sent from before these changes (current master) and so wouldn't have the stateVersion in delivery.

Reviewers: marcin, tomek

Reviewed By: marcin, tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8706