Fix CI failures: route presenter options logic and domain V2 serialization

Route presenter: preserve original behavior where options: {} is
included for routes with empty options, but omit options when all
keys are internal-only (access_scope, access_rules).

Domain model: remove enforce_access_rules and access_rules_scope
from V2 export/import_attributes — these are V3-only fields exposed
through the domain presenter, not the legacy V2 API.

Author: rkoster

app/models/runtime/domain.rb

@@ -79,8 +79,8 @@ def shared_or_owned_by(organization_ids)
     one_to_many :labels, class: 'VCAP::CloudController::DomainLabelModel', key: :resource_guid, primary_key: :guid
     one_to_many :annotations, class: 'VCAP::CloudController::DomainAnnotationModel', key: :resource_guid, primary_key: :guid
 
-    export_attributes :name, :owning_organization_guid, :shared_organizations, :enforce_access_rules, :access_rules_scope
-    import_attributes :name, :owning_organization_guid, :enforce_access_rules, :access_rules_scope
+    export_attributes :name, :owning_organization_guid, :shared_organizations
+    import_attributes :name, :owning_organization_guid
     strip_attributes :name
 
     add_association_dependencies labels: :destroy

app/presenters/v3/route_presenter.rb

@@ -50,7 +50,7 @@ def to_hash
       }
       unless route.options.nil?
         public_options = route.options.reject { |k, _| INTERNAL_ROUTE_OPTIONS.include?(k.to_s) }
-        hash.merge!(options: public_options)
+        hash.merge!(options: public_options) if route.options.empty? || public_options.present?
       end
 
       @decorators.reduce(hash) { |memo, d| d.decorate(memo, [route]) }