Revert "Don't include projects shared as group-descendants"

This reverts commit 2c3c5b35.

Revisit this after https://gitlab.com/gitlab-org/gitlab-ce/issues/45441

app/finders/group_descendants_finder.rb

@@ -134,10 +134,8 @@ class GroupDescendantsFinder
   end
   def direct_child_projects
-    GroupProjectsFinder.new(group: parent_group,
-                            current_user: current_user,
-                            options: { only_owned: true },
-                            params: params).execute
+    GroupProjectsFinder.new(group: parent_group, current_user: current_user, params: params)
+      .execute
   end
   # Finds all projects nested under `parent_group` or any of its descendant

changelogs/unreleased/bvl-shared-groups-on-group-page.yml

 ---
-title: Show shared projects on group list
-  list
+title: Show shared projects on group page
 merge_request: 18390
 author:
 type: fixed

spec/finders/group_descendants_finder_spec.rb

@@ -35,15 +35,6 @@ 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' } }