I think it makes the most sense to handle this conversion from `Uint8Array` to `string` before encoding the data in the QR codes, so clients reading the QR code don't need to handle it. I used @bartek's helper functions in `lib/media/data-utils.js` to achieve this.
Addresses [[ https://linear.app/comm/issue/ENG-4934/convert-aes-key-from-uint8array-to-string | ENG-4934 ]]
Depends on D9180