feat: update reviewer suggestions form
- Add Textarea and CalloutBox elements
This is deliberately incomplete. According to @Nick only the initially displayed fields should be required and fields added by the user should be optional. This turns out to be hard to model with Yup. I spent a morning on it then decided to park it until we're sure this is the final behaviour. For now, every field is required.
The editor fields also need to be connected to the people picker component.
Edited by Tamlyn Rhodes