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/widget/components/ChatInputWrap.vue

@@ -57,7 +57,7 @@ import FluentIcon from 'shared/components/FluentIcon/Index.vue';
 import ResizableTextArea from 'shared/components/ResizableTextArea.vue';
 import darkModeMixin from 'widget/mixins/darkModeMixin.js';
 
-const EmojiInput = () => import('shared/components/emoji/EmojiInput');
+const EmojiInput = () => import('shared/components/emoji/EmojiInput.vue');
 
 export default {
   name: 'ChatInputWrap',