feat: Replace the use of macroMixin with a composable (#9912)

# Pull Request Template

## Description

This PR will replace usage of `macroMixin` with the `useMacros`
composable. And updated components from option API to composition API.

**Files updated**
1. dashboard/routes/dashboard/settings/macros/MacroNode.vue
2. dashboard/routes/dashboard/settings/macros/MacroEditor.vue

Fixes
https://linear.app/chatwoot/issue/CW-3449/rewrite-macrosmixin-mixin-to-a-composable

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

**Test cases**
1. Check whether we can create a new macro.
2. Check whether validations and error animation are working or not.
3. Ability to drag the macro files
4. Check whether the edit pages and functionality is working or not.


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] 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

app/javascript/dashboard/composables/useMacros.js

@@ -0,0 +1,44 @@
+import { computed } from 'vue';
+import { useStoreGetters } from 'dashboard/composables/store';
+import { PRIORITY_CONDITION_VALUES } from 'dashboard/helper/automationHelper.js';
+
+/**
+ * Composable for handling macro-related functionality
+ * @returns {Object} An object containing the getMacroDropdownValues function
+ */
+export const useMacros = () => {
+  const getters = useStoreGetters();
+
+  const labels = computed(() => getters['labels/getLabels'].value);
+  const teams = computed(() => getters['teams/getTeams'].value);
+  const agents = computed(() => getters['agents/getAgents'].value);
+
+  /**
+   * Get dropdown values based on the specified type
+   * @param {string} type - The type of dropdown values to retrieve
+   * @returns {Array} An array of dropdown values
+   */
+  const getMacroDropdownValues = type => {
+    switch (type) {
+      case 'assign_team':
+      case 'send_email_to_team':
+        return teams.value;
+      case 'assign_agent':
+        return [{ id: 'self', name: 'Self' }, ...agents.value];
+      case 'add_label':
+      case 'remove_label':
+        return labels.value.map(i => ({
+          id: i.title,
+          name: i.title,
+        }));
+      case 'change_priority':
+        return PRIORITY_CONDITION_VALUES;
+      default:
+        return [];
+    }
+  };
+
+  return {
+    getMacroDropdownValues,
+  };
+};