fix: Update broken specs (#8651)

- Use fakeTimer for time.spec.js
- Use default sort as last_activity_at_desc
- Update specs for getAllConversations getter

app/javascript/dashboard/store/modules/specs/conversations/conversations.fixtures.js

@@ -0,0 +1,34 @@
+export default [
+  {
+    created_at: 1702411932, // Dec 12, 2023 12:12:12
+    id: 1,
+    last_activity_at: 1704408443, // Jan 04, 2024 14:47:23
+    messages: [{ content: 'test1' }],
+    priority: 'medium',
+    waiting_since: 0, // not waiting
+  },
+  {
+    created_at: 1699819932, // Nov 12, 2023 12:12:12
+    id: 2,
+    last_activity_at: 1704485532, // Jan 05, 2024 12:12:12
+    messages: [{ content: 'test2' }],
+    priority: 'low',
+    waiting_since: 1683645800, // May 09 2023 15:23:20
+  },
+  {
+    created_at: 1641413532, // Jan 05, 2022 12:12:12
+    id: 3,
+    last_activity_at: 1704408567, // Jan 04, 2024 14:49:27
+    messages: [{ content: 'test3' }],
+    priority: 'low',
+    waiting_since: 0, // not waiting
+  },
+  {
+    created_at: 1641413531, // Jan 05, 2022 12:12:11
+    id: 4,
+    last_activity_at: 1704408566, // Jan 04, 2024 14:49:26
+    messages: [{ content: 'test4' }],
+    priority: 'high',
+    waiting_since: 1683645801, // May 09 2023 15:23:21
+  },
+];