Merge branch 'winh-dashboard_spec-performance' into 'master'

Destroy component instances in environments dashboard tests

Closes #11443

See merge request gitlab-org/gitlab-ee!12644

ee/spec/frontend/environments_dashboard/components/dashboard_spec.js

@@ -47,6 +47,7 @@ describe('dashboard', () => {
   });
 
   afterEach(() => {
+    wrapper.destroy();
     store.replaceState(state());
   });