[PM-1632] Redirect on `SsoRequired` - return SsoOrganizationIdentifier (#6597)
feat: add SSO request validation and organization identifier lookup
- Implement SsoRequestValidator to validate SSO requirements
- Add UserSsoOrganizationIdentifierQuery to fetch organization identifiers
- Create SsoOrganizationIdentifier custom response for SSO redirects
- Add feature flag (RedirectOnSsoRequired) for gradual rollout
- Register validators and queries in dependency injection
- Create RequestValidationConstants to reduce magic strings
- Add comprehensive test coverage for validation logic
- Update BaseRequestValidator to consume SsoRequestValidator
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Ike