Deleting the lifecycle environment fails with error 'Cannot delete record because of dependent hosts'

Issue

• Deleting lifecycle environment fails with error 'Cannot delete record because of dependent hosts'

 Completed 200 OK in 47ms (Views: 24.8ms | ActiveRecord: 7.8ms)
 Processing by Katello::Api::V2::EnvironmentsController#destroy as JSON
 Parameters: {"organization_id"=>"3", "api_version"=>"v2", "id"=>"xx"}
 cannot delete record because of dependent hosts (ActiveRecord::DeleteRestrictionError)