Job collaboration notifications
Collaborators receive an in-app notification and an email when:
- Someone submits feedback (only authors receive this one). 
- Someone replies to their feedback. 
- Someone adds a comment in a thread they’re a part of. 
- They’re mentioned in a comment. 
- The author requests they provide additional review. 
- Their collaborator role is changed. 
- They’re removed as a collaborator. 
- The job is published. 
