fix: Set GroupNameTimestamp on group promotion (#6729)

Otherwise if an invite link is generated and the group is renamed then before the promotion, the
joined member will have the group name from the invite link, not the new one.

src/receive_imf/receive_imf_tests.rs

@@ -5433,6 +5433,29 @@ async fn test_rename_chat_on_missing_message() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_rename_chat_after_creating_invite() -> Result<()> {
+    let mut tcm = TestContextManager::new();
+    let alice = &tcm.alice().await;
+    let bob = &tcm.bob().await;
+    for populate_before_securejoin in [false, true] {
+        let alice_chat_id = create_group_chat(alice, ProtectionStatus::Protected, "Group").await?;
+        let qr = get_securejoin_qr(alice, Some(alice_chat_id)).await?;
+
+        SystemTime::shift(Duration::from_secs(60));
+        chat::set_chat_name(alice, alice_chat_id, "Renamed").await?;
+        if populate_before_securejoin {
+            send_text_msg(alice, alice_chat_id, "populate".to_string()).await?;
+            alice.pop_sent_msg().await;
+        }
+
+        let bob_chat_id = tcm.exec_securejoin_qr(bob, alice, &qr).await;
+        let bob_chat = Chat::load_from_db(bob, bob_chat_id).await?;
+        assert_eq!(bob_chat.get_name(), "Renamed");
+    }
+    Ok(())
+}
+
 /// Tests that creating a group
 /// is preferred over assigning message to existing
 /// chat based on `In-Reply-To` and `References`.