enh(tmq): add drop msg to vnode

source/dnode/mnode/impl/src/mndSubscribe.c

@@ -73,6 +73,7 @@ int32_t mndInitSubscribe(SMnode *pMnode) {
                      .deleteFp = (SdbDeleteFp)mndSubActionDelete};
 
   mndSetMsgHandle(pMnode, TDMT_VND_MQ_VG_CHANGE_RSP, mndProcessSubscribeInternalRsp);
+  mndSetMsgHandle(pMnode, TDMT_VND_MQ_VG_DELETE_RSP, mndProcessSubscribeInternalRsp);
   mndSetMsgHandle(pMnode, TDMT_MND_MQ_DO_REBALANCE, mndProcessRebalanceReq);
 
   mndAddShowRetrieveHandle(pMnode, TSDB_MGMT_TABLE_SUBSCRIPTIONS, mndRetrieveSubscribe);

source/dnode/vnode/src/tq/tq.c

@@ -863,7 +863,10 @@ int32_t tqProcessPollReq(STQ* pTq, SRpcMsg* pMsg, int32_t workerId) {
 
 int32_t tqProcessVgDeleteReq(STQ* pTq, char* msg, int32_t msgLen) {
   SMqVDeleteReq* pReq = (SMqVDeleteReq*)msg;
-  return taosHashRemove(pTq->execs, pReq->subKey, strlen(pReq->subKey));
+
+  int32_t code = taosHashRemove(pTq->execs, pReq->subKey, strlen(pReq->subKey));
+  ASSERT(code == 0);
+  return 0;
 }
 
 // TODO: persist meta into tdb