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/dashboard/components/app/PaymentPendingBanner.vue

@@ -10,9 +10,9 @@
 </template>
 
 <script>
-import Banner from 'dashboard/components/ui/Banner.vue';
 import { mapGetters } from 'vuex';
-import adminMixin from 'dashboard/mixins/isAdmin';
+import { useAdmin } from 'dashboard/composables/useAdmin';
+import Banner from 'dashboard/components/ui/Banner.vue';
 import accountMixin from 'dashboard/mixins/account';
 
 const EMPTY_SUBSCRIPTION_INFO = {
@@ -22,7 +22,13 @@ const EMPTY_SUBSCRIPTION_INFO = {
 
 export default {
   components: { Banner },
-  mixins: [adminMixin, accountMixin],
+  mixins: [accountMixin],
+  setup() {
+    const { isAdmin } = useAdmin();
+    return {
+      isAdmin,
+    };
+  },
   computed: {
     ...mapGetters({
       isOnChatwootCloud: 'globalConfig/isOnChatwootCloud',

app/javascript/dashboard/components/app/PendingEmailVerificationBanner.vue

@@ -14,11 +14,11 @@
 import Banner from 'dashboard/components/ui/Banner.vue';
 import { mapGetters } from 'vuex';
 import accountMixin from 'dashboard/mixins/account';
-import alertMixin from 'shared/mixins/alertMixin';
+import { useAlert } from 'dashboard/composables';
 
 export default {
   components: { Banner },
-  mixins: [accountMixin, alertMixin],
+  mixins: [accountMixin],
   computed: {
     ...mapGetters({
       currentUser: 'getCurrentUser',
@@ -36,7 +36,7 @@ export default {
   methods: {
     resendVerificationEmail() {
       this.$store.dispatch('resendConfirmation');
-      this.showAlert(this.$t('APP_GLOBAL.EMAIL_VERIFICATION_SENT'));
+      useAlert(this.$t('APP_GLOBAL.EMAIL_VERIFICATION_SENT'));
     },
   },
 };

app/javascript/dashboard/components/app/UpdateBanner.vue

@@ -14,15 +14,20 @@ import Banner from 'dashboard/components/ui/Banner.vue';
 import { LOCAL_STORAGE_KEYS } from 'dashboard/constants/localStorage';
 import { LocalStorage } from 'shared/helpers/localStorage';
 import { mapGetters } from 'vuex';
-import adminMixin from 'dashboard/mixins/isAdmin';
+import { useAdmin } from 'dashboard/composables/useAdmin';
 import { hasAnUpdateAvailable } from './versionCheckHelper';
 
 export default {
   components: { Banner },
-  mixins: [adminMixin],
   props: {
     latestChatwootVersion: { type: String, default: '' },
   },
+  setup() {
+    const { isAdmin } = useAdmin();
+    return {
+      isAdmin,
+    };
+  },
   data() {
     return { userDismissedBanner: false };
   },

app/javascript/dashboard/components/app/UpgradeBanner.vue

@@ -12,13 +12,12 @@
 <script>
 import Banner from 'dashboard/components/ui/Banner.vue';
 import { mapGetters } from 'vuex';
-import adminMixin from 'dashboard/mixins/isAdmin';
 import accountMixin from 'dashboard/mixins/account';
 import { differenceInDays } from 'date-fns';
 
 export default {
   components: { Banner },
-  mixins: [adminMixin, accountMixin],
+  mixins: [accountMixin],
   data() {
     return { conversationMeta: {} };
   },