feat: Use vitest instead of jest, run all the specs anywhere in app/ folder in the CI (#9722)

Due to the pattern `**/specs/*.spec.js` defined in CircleCI, none of the
frontend spec in the folders such as
`specs/<domain-name>/getters.spec.js` were not executed in Circle CI.

This PR fixes the issue, along with the following changes: 
- Use vitest instead of jest
- Remove jest dependancies
- Update tests to work with vitest

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/shared/components/specs/DateSeparator.spec.js

@@ -1,4 +1,4 @@
-import DateSeparator from '../DateSeparator';
+import DateSeparator from '../DateSeparator.vue';
 import { createLocalVue, shallowMount } from '@vue/test-utils';
 import Vuex from 'vuex';
 import VueI18n from 'vue-i18n';

app/javascript/shared/components/specs/Spinner.spec.js

@@ -1,5 +1,5 @@
 import { mount } from '@vue/test-utils';
-import Spinner from '../Spinner';
+import Spinner from '../Spinner.vue';
 
 describe('Spinner', () => {
   test('matches snapshot', () => {

app/javascript/shared/components/specs/__snapshots__/DateSeparator.spec.js.snap

@@ -1,11 +1,10 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
-exports[`dateSeparator date separator snapshot 1`] = `
+exports[`dateSeparator > date separator snapshot 1`] = `
 <div
   class="date--separator text-slate-700"
+  data-v-b24b73fa=""
 >
-  
-  Nov 18, 2019
-
+   Nov 18, 2019 
 </div>
 `;

app/javascript/shared/components/specs/__snapshots__/Spinner.spec.js.snap

@@ -1,7 +1,8 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
-exports[`Spinner matches snapshot 1`] = `
+exports[`Spinner > matches snapshot 1`] = `
 <span
   class="spinner small "
+  data-v-3e416633=""
 />
 `;