Merge branch 'remove-gitlab-ui-file' into 'master'

Remove GitLab UI file to match CE

See merge request gitlab-org/gitlab-ee!8366

app/assets/javascripts/commons/gitlab_ui.js

-import Vue from 'vue';
-import { GlLoadingIcon } from '@gitlab-org/gitlab-ui';
-
-Vue.component('gl-loading-icon', GlLoadingIcon);