fix im forwarding and message list regressions

server/store/group_message_runtime_test.go

@@ -49,6 +49,12 @@ func (r *testGroupMessageRuntime) MarkDone(_ types.TenantID, topic string, from
 	return nil
 }
 
+func (r *testGroupMessageRuntime) MarkPending(_ types.TenantID, topic string, from types.Uid, clientMsgID string, seq int64) error {
+	key := topic + ":" + from.UserId() + ":" + clientMsgID
+	r.claims[key] = &groupMessageUniqueRecord{Status: "pending", Seq: seq, CreatedAt: time.Now().UTC()}
+	return nil
+}
+
 func (r *testGroupMessageRuntime) MarkFailed(_ types.TenantID, topic string, from types.Uid, clientMsgID string) error {
 	key := topic + ":" + from.UserId() + ":" + clientMsgID
 	r.claims[key] = &groupMessageUniqueRecord{Status: "failed", CreatedAt: time.Now().UTC()}