Change Details

[ENG-6145](https://linear.app/comm/issue/ENG-6145/change-backup-restore-endpoint-to-expect-username-or-wallet-address). TBD Depends on D13840

[ENG-6145](https://linear.app/comm/issue/ENG-6145/change-backup-restore-endpoint-to-expect-username-or-wallet-address). This allows us to decrease code duplication (next diff) and use the same interface for wallet/username users. Additionally, moving restore methods to `BackupMenu` as this is for now only for testing purposes and we'll need something different for actual backup. Depends on D13840

[ENG-6145](https://linear.app/comm/issue/ENG-6145/change-backup-restore-endpoint-to-expect-username-or-wallet-address). TBDhis allows us to decrease code duplication (next diff) and use the same interface for wallet/username users. Additionally, moving restore methods to `BackupMenu` as this is for now only for testing purposes and we'll need something different for actual backup. Depends on D13840