Issue #3328366 by heddn: Rebuild views to remove 'core' key

config/optional/views.view.group_members.yml

modules/gnode/config/optional/views.view.group_nodes.yml

...lugin/config/optional/views.view.entity_test_relation.yml

..._test_plugin/config/optional/views.view.node_relation.yml

tests/modules/group_test_views/group_test_views.info.yml

...st_views/test_views/views.view.test_group_id_argument.yml

...s.view.test_group_relationship_to_entity_relationship.yml

...est_group_relationship_to_entity_reverse_relationship.yml

...ws.view.test_group_to_group_relationship_relationship.yml