Created a isLoggedIn utils method

Converted similar uses to use the utils isLoggedIn method

app/assets/javascripts/diffs/components/diff_row.vue

 <script>
 /* eslint-disable vue/no-v-html */
 import { memoize } from 'lodash';
+import { isLoggedIn } from '~/lib/utils/common_utils';
 import {
   PARALLEL_DIFF_VIEW_TYPE,
   CONFLICT_MARKER_THEIR,
@@ -16,8 +17,6 @@ import {
 import DiffGutterAvatars from './diff_gutter_avatars.vue';
 import * as utils from './diff_row_utils';
 
-const isLoggedIn = () => Boolean(window.gon?.current_user_id);
-
 export default {
   DiffGutterAvatars,
   CodeQualityGutterIcon: () => import('ee_component/diffs/components/code_quality_gutter_icon.vue'),

app/assets/javascripts/frequent_items/store/actions.js

 import AccessorUtilities from '~/lib/utils/accessor';
+import { isLoggedIn } from '~/lib/utils/common_utils';
 import { getGroups, getProjects } from '~/rest_api';
 import { getTopFrequentItems } from '../utils';
 import * as types from './mutation_types';
@@ -51,7 +52,7 @@ export const fetchSearchedItems = ({ state, dispatch }, searchQuery) => {
   const params = {
     simple: true,
     per_page: 20,
-    membership: Boolean(gon.current_user_id),
+    membership: isLoggedIn(),
   };
 
   let searchFunction;

app/assets/javascripts/lib/utils/common_utils.js

@@ -763,3 +763,5 @@ export const isFeatureFlagEnabled = (flag) => window.gon.features?.[flag];
  * @returns {Array[String]} Converted array
  */
 export const convertArrayToCamelCase = (array) => array.map((i) => convertToCamelCase(i));
+
+export const isLoggedIn = () => Boolean(window.gon?.current_user_id);

app/assets/javascripts/notes/components/noteable_discussion.vue

@@ -4,6 +4,7 @@ import { mapActions, mapGetters } from 'vuex';
 import DraftNote from '~/batch_comments/components/draft_note.vue';
 import createFlash from '~/flash';
 import { clearDraft, getDiscussionReplyKey } from '~/lib/utils/autosave';
+import { isLoggedIn } from '~/lib/utils/common_utils';
 import { s__, __ } from '~/locale';
 import diffLineNoteFormMixin from '~/notes/mixins/diff_line_note_form';
 import TimelineEntryItem from '~/vue_shared/components/notes/timeline_entry_item.vue';
@@ -85,7 +86,7 @@ export default {
       return this.getUserData;
     },
     isLoggedIn() {
-      return Boolean(gon.current_user_id);
+      return isLoggedIn();
     },
     autosaveKey() {
       return getDiscussionReplyKey(this.firstNote.noteable_type, this.discussion.id);

app/assets/javascripts/repository/components/blob_content_viewer.vue

@@ -5,6 +5,7 @@ import BlobContent from '~/blob/components/blob_content.vue';
 import BlobHeader from '~/blob/components/blob_header.vue';
 import { SIMPLE_BLOB_VIEWER, RICH_BLOB_VIEWER } from '~/blob/components/constants';
 import createFlash from '~/flash';
+import { isLoggedIn } from '~/lib/utils/common_utils';
 import { __ } from '~/locale';
 import blobInfoQuery from '../queries/blob_info.query.graphql';
 import BlobEdit from './blob_edit.vue';
@@ -90,7 +91,7 @@ export default {
   },
   computed: {
     isLoggedIn() {
-      return Boolean(gon.current_user_id);
+      return isLoggedIn();
     },
     isLoading() {
       return this.$apollo.queries.project.loading;

app/assets/javascripts/sidebar/components/subscriptions/sidebar_subscriptions_widget.vue

@@ -2,6 +2,7 @@
 import { GlIcon, GlLoadingIcon, GlToggle, GlTooltipDirective } from '@gitlab/ui';
 import createFlash from '~/flash';
 import { IssuableType } from '~/issue_show/constants';
+import { isLoggedIn } from '~/lib/utils/common_utils';
 import { __, sprintf } from '~/locale';
 import SidebarEditableItem from '~/sidebar/components/sidebar_editable_item.vue';
 import { subscribedQueries } from '~/sidebar/constants';
@@ -102,7 +103,7 @@ export default {
       });
     },
     isLoggedIn() {
-      return Boolean(gon.current_user_id);
+      return isLoggedIn();
     },
     canSubscribe() {
       return this.emailsDisabled || !this.isLoggedIn;

app/assets/javascripts/vue_shared/components/markdown/suggestion_diff_header.vue

 <script>
 import { GlButton, GlLoadingIcon, GlTooltipDirective, GlIcon } from '@gitlab/ui';
+import { isLoggedIn } from '~/lib/utils/common_utils';
 import { __ } from '~/locale';
 import ApplySuggestion from './apply_suggestion.vue';
 
@@ -73,7 +74,7 @@ export default {
       return __('Applying suggestions...');
     },
     isLoggedIn() {
-      return Boolean(gon.current_user_id);
+      return isLoggedIn();
     },
   },
   methods: {