Remove unused iconTimerSvg from time_ago.vue

app/assets/javascripts/pipelines/components/pipelines_list/time_ago.vue

 <script>
 import { GlIcon } from '@gitlab/ui';
-import iconTimerSvg from 'icons/_icon_timer.svg';
 import '~/lib/utils/datetime_utility';
 import tooltip from '~/vue_shared/directives/tooltip';
 import timeagoMixin from '~/vue_shared/mixins/timeago';
@@ -21,11 +20,6 @@ export default {
       required: true,
     },
   },
-  data() {
-    return {
-      iconTimerSvg,
-    };
-  },
   computed: {
     hasDuration() {
       return this.duration > 0;