Remove icon components.

app/assets/javascripts/vue_common_component/loading_icon.js.es6

-(() => {
-  Vue.component('loading-icon', {
-    template: `
-      <i class="fa fa-spinner fa-spin loading-icon"></i>
-    `,
-  });
-})();
-

spec/javascripts/vue_common_components/fa_icon_spec.js.es6

-/* eslint-disable */
-//= require jquery
-//= require vue
-//= require issuable_time_tracker
-
-((gl) => {
-  describe('Font Awesome Icon Component', function() {
-    describe('Initialization', function() {
-      is defined
-      has containing elements
-      configuration, including computed values and special config
-      loading state
-    });
-
-    describe('Invalid input', function() {
-      defaults applied or errors thrown
-    });
-
-    describe('Icons Rendered', function() {
-      single icon Rendered
-      multiple icons rendererd
-    });
-  });
-})(window.gl || (window.gl = {}));