slapos_cloud: Include missing related keys

master/bt5/slapos_cloud/CatalogRelatedKeyTemplateItem/related_key_list.xml

 <key_list>
  <key>causality_subscription_request_related_uid | category,catalog/uid/z_related_causality_subscription_request</key>
+ <key>default_or_child_aggregate_reference | catalog,category,catalog/reference/z_related_default_or_child_aggregate</key>
+ <key>default_or_child_aggregate_uid | catalog,category,catalog/uid/z_related_default_or_child_aggregate</key>
  <key>related_predecessor_but_with_different_title_than_catalog_title | category,catalog/uid/z_related_predecessor_but_with_different_title_than_catalog_title</key>
 </key_list>
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master/bt5/slapos_cloud/bt/template_catalog_related_key_list

 causality_subscription_request_related_uid | category,catalog/uid/z_related_causality_subscription_request
 related_predecessor_but_with_different_title_than_catalog_title | category,catalog/uid/z_related_predecessor_but_with_different_title_than_catalog_title
+default_or_child_aggregate_reference | catalog,category,catalog/reference/z_related_default_or_child_aggregate
+default_or_child_aggregate_uid | catalog,category,catalog/uid/z_related_default_or_child_aggregate
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