Add missing test for Microsoft Teams notify_only_default_branch flag

spec/models/project_services/microsoft_teams_service_spec.rb

@@ -289,6 +289,18 @@ describe MicrosoftTeamsService do
           expect(result).to be_falsy
         end
       end
+
+      context 'when disabled' do
+        let(:pipeline) do
+          create(:ci_pipeline, :failed, project: project, ref: 'not-the-default-branch')
+        end
+
+        before do
+          chat_service.notify_only_default_branch = false
+        end
+
+        it_behaves_like 'call Microsoft Teams API'
+      end
     end
   end
 end