Finalise communication plan and implementation alignment for PAT expiration

Agree on the user communication for enabling expiration of Personal Access Tokens (PATs), including the email content, timing, and delivery method.

Ensure the communication plan is aligned with our implementation and timeline. Confirm that dev team has enough time to make any required adjustments to support the agreed rollout plan.

## Acceptance Criteria

- [x] Emails content approved
- [ ] Communication delivery and schedule agreed
- [ ] Timeline agreed and feasible from an implementation perspective
- [ ] Ready to proceed with rollout