desc: use tcm in test_forward_group

Author: link2xt

src/chat/chat_tests.rs

@@ -2039,8 +2039,9 @@ async fn test_forward_quote() -> Result<()> {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn test_forward_group() -> Result<()> {
-    let alice = TestContext::new_alice().await;
-    let bob = TestContext::new_bob().await;
+    let mut tcm = TestContextManager::new();
+    let alice = tcm.alice().await;
+    let bob = tcm.bob().await;
 
     let alice_chat = alice.create_chat(&bob).await;
     let bob_chat = bob.create_chat(&alice).await;