Proto: update receipts for denunciations

What / Why

As the denunciation operations are rehauled in !18032 (merged), this is a good time to update their receipts considering these changes as well as older changes.

• balance_updates field has been removed, because denunciations no longer produce them since slashing has been delayed in Oxford
• forbidden_delegate field is renamed to punished_delegate and is no longer an option, since forbidding is now systematic
• rewarded_delegate field has been added, because it's no longer easily retrievable from balance updates
• misbehaviour field has been added because it's important information, and notably allows to distinguish between double-preattesting and double-attesting, which is no longer possible from the denunciation operation kind alone.

Fixes #7976 (closed)