Add :nested_groups metadata to tests using subgroups

spec/requests/api/groups_spec.rb

@@ -490,7 +490,7 @@ describe API::Groups do
         expect(json_response.first['visibility']).not_to be_present
       end
-      it 'filters the groups projects' do
+      it "filters the groups projects" do
         public_project = create(:project, :public, path: 'test1', group: group1)
         get api("/groups/#{group1.id}/projects", user1), visibility: 'public'
@@ -502,7 +502,7 @@ describe API::Groups do
         expect(json_response.first['name']).to eq(public_project.name)
       end
-      it 'returns projects excluding shared' do
+      it "returns projects excluding shared" do
         create(:project_group_link, project: create(:project), group: group1)
         create(:project_group_link, project: create(:project), group: group1)
         create(:project_group_link, project: create(:project), group: group1)
@@ -515,7 +515,7 @@ describe API::Groups do
         expect(json_response.length).to eq(2)
       end
-      it 'returns projects including those in subgroups' do
+      it "returns projects including those in subgroups", :nested_groups do
         subgroup = create(:group, parent: group1)
         create(:project, group: subgroup)
         create(:project, group: subgroup)