Create private partner channels
### Problem/Motivation
New partners get a private onboarding channel which has been useful for communication. This would be good for all partners for questions, reports, sharing info, etc.
### Proposed resolution
Create private channel for all partners who don't have one. Add contribution coordinator and all contributors from each company.
### Target date or deadline
June 2026
### Remaining tasks
- Create list of partners without channels
- Create private channel for each of these
- Add contributor coordinator and accountable contacts
- Add all partner contributors
issue