feat: Replace alertMixin usage with useAlert (#9793)

# Pull Request Template

## Description

This PR will replace the usage of `alertMixin` from the code base with
the `useAlert` composable.

Fixes
https://linear.app/chatwoot/issue/CW-3462/replace-alertmixin-usage-with-usealert

## Type of change

- [x] Breaking change (fix or feature that would cause existing
functionality not to work as expected)

## How Has This Been Tested?

Please refer this issue description

https://linear.app/chatwoot/issue/CW-3462/replace-alertmixin-usage-with-usealert


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/javascript/v3/views/auth/reset/password/Index.vue

@@ -47,17 +47,17 @@
 </template>
 
 <script>
+import { mapGetters } from 'vuex';
+import { useAlert } from 'dashboard/composables';
 import { required, minLength, email } from 'vuelidate/lib/validators';
 import globalConfigMixin from 'shared/mixins/globalConfigMixin';
-import { mapGetters } from 'vuex';
 import FormInput from '../../../../components/Form/Input.vue';
 import { resetPassword } from '../../../../api/auth';
 import SubmitButton from '../../../../components/Button/SubmitButton.vue';
-import alertMixin from 'shared/mixins/alertMixin';
 
 export default {
   components: { FormInput, SubmitButton },
-  mixins: [globalConfigMixin, alertMixin],
+  mixins: [globalConfigMixin],
   data() {
     return {
       credentials: { email: '' },
@@ -84,7 +84,7 @@ export default {
     showAlertMessage(message) {
       // Reset loading, current selected agent
       this.resetPassword.showLoading = false;
-      this.showAlert(message);
+      useAlert(message);
     },
     submit() {
       this.resetPassword.showLoading = true;