chore: Update availability status everywhere if the user changes the status from the account menu (#2581)

* add agent mixin

* apply agent mixin in components

* review fixes

* fix specs

app/javascript/dashboard/mixins/specs/agentMixin.spec.js

@@ -0,0 +1,38 @@
+import { shallowMount, createLocalVue } from '@vue/test-utils';
+import agentMixin from '../agentMixin';
+import agentFixtures from './agentFixtures';
+import Vuex from 'vuex';
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('agentMixin', () => {
+  let getters;
+  let store;
+  beforeEach(() => {
+    getters = {
+      getCurrentUser: () => ({
+        id: 1,
+        availability_status: 'busy',
+      }),
+    };
+    store = new Vuex.Store({ getters });
+  });
+
+  it('return formatted agents', () => {
+    const Component = {
+      render() {},
+      title: 'TestComponent',
+      mixins: [agentMixin],
+      data() {
+        return { inboxId: 1 };
+      },
+      computed: {
+        assignableAgents() {
+          return agentFixtures.allAgents;
+        },
+      },
+    };
+    const wrapper = shallowMount(Component, { store, localVue });
+    expect(wrapper.vm.agentsList).toEqual(agentFixtures.formattedAgents);
+  });
+});