Don't include projects shared as group-descendants

When a project is shared with a group, it should not be included as a
descendant on the group dashboard.

app/finders/group_descendants_finder.rb

@@ -121,8 +121,10 @@ class GroupDescendantsFinder
   end
 
   def direct_child_projects
-    GroupProjectsFinder.new(group: parent_group, current_user: current_user, params: params)
-      .execute
+    GroupProjectsFinder.new(group: parent_group,
+                            current_user: current_user,
+                            options: { only_owned: true },
+                            params: params).execute
   end
 
   # Finds all projects nested under `parent_group` or any of its descendant

spec/finders/group_descendants_finder_spec.rb

@@ -35,6 +35,15 @@ describe GroupDescendantsFinder do
       expect(finder.execute).to contain_exactly(project)
     end
 
+    it 'does not include projects shared with the group' do
+      project = create(:project, namespace: group)
+      other_project = create(:project)
+      other_project.project_group_links.create(group: group,
+                                               group_access: ProjectGroupLink::MASTER)
+
+      expect(finder.execute).to contain_exactly(project)
+    end
+
     context 'when archived is `true`' do
       let(:params) { { archived: 'true' } }
 
@@ -64,7 +73,7 @@ describe GroupDescendantsFinder do
     end
 
     context 'with a filter' do
-      let(:params) { { filter: 'test' } }
+      let(:params) { { filter: 'tes' } }
 
       it 'includes only projects matching the filter' do
         _other_project = create(:project, namespace: group)