Merge branch 'winh-jest-vue-tips' into 'master'

Disable Vue tips when running Jest

See merge request gitlab-org/gitlab-ce!26717

spec/frontend/test_setup.js

@@ -22,4 +22,7 @@ beforeEach(done => {
   done();
 });
 
+Vue.config.devtools = false;
+Vue.config.productionTip = false;
+
 Vue.use(Translate);