[fix](move-memtable) close stream when cancel load stream stub (apach…

…e#38912)

Fix load stream leak when sink v2 meet error.
Tested by `check_before_quit.groovy`.

be/src/vec/sink/load_stream_stub.cpp

@@ -338,6 +338,9 @@ Status LoadStreamStub::close_wait(RuntimeState* state, int64_t timeout_ms) {
 
 void LoadStreamStub::cancel(Status reason) {
  LOG(WARNING) << *this << " is cancelled because of " << reason;
+ if (_is_init.load()) {
+ brpc::StreamClose(_stream_id);
+ }
  {
  std::lock_guard<bthread::Mutex> lock(_cancel_mutex);
  _cancel_reason = reason;