This change makes admin contacts optional for private registrants while keeping them mandatory for organizations. The changes include:
- Updated Domain model validations to make admin and tech contacts optional (min=0) for private registrants
- Added validation rules methods to handle different requirements based on registrant type
- Modified EPP domain creation to support domains without admin contacts for private registrants
- Updated attach_default_contacts to skip adding contacts for private registrants
- Added comprehensive test coverage for:
- Domain model validations with private/org registrants
- EPP domain creation without admin contacts for private registrants
- REPP API contact management for private registrants
This implements the requirement to make admin contacts optional for private registrations of .ee domains while maintaining the existing validation rules for organizations.