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/composables/index.js

@@ -1,6 +1,10 @@
 import { getCurrentInstance } from 'vue';
 import { emitter } from 'shared/helpers/mitt';
 
+/**
+ * Custom hook to track events
+ * @returns {Function} The track function
+ */
 export const useTrack = () => {
   const vm = getCurrentInstance();
   if (!vm) throw new Error('must be called in setup');
@@ -8,6 +12,11 @@ export const useTrack = () => {
   return vm.proxy.$track;
 };
 
-export function useAlert(message, action) {
-  emitter.emit('newToastMessage', message, action);
-}
+/**
+ * Emits a toast message event using a global emitter.
+ * @param {string} message - The message to be displayed in the toast.
+ * @param {Object|null} action - Optional callback function or object to execute.
+ */
+export const useAlert = (message, action = null) => {
+  emitter.emit('newToastMessage', { message, action });
+};