Previously, copying was done while holding a lock; Now, get block while
holding the lock and then copy
https://github.com/apache/doris/pull/37462
## Proposed changes
Issue Number: close #xxx
<!--Describe your changes.-->
## Proposed changes
pick #36748
```cpp
RETURN_IF_ERROR(vectorized::MutableBlock(block).merge(*pos_to_pull->_block))
```
this line may throw an exception(cannot allocate)
```
*** Query id: b7b80bfd76cc42a5-a9916f8364d5a4d3 ***
*** tablet id: 0 ***
*** Aborted at 1719187603 (unix time) try "date -d @1719187603" if you are using GNU date ***
*** Current BE git commitID: a8c48f5328 ***
*** SIGSEGV address not mapped to object (@0x47) received by PID 1197117 (TID 1197376 OR 0x7f49a25e4640) from PID 71; stack trace: ***
0# doris::signal::(anonymous namespace)::FailureSignalHandler(int, siginfo_t*, void*) at /root/doris_branch-2.0/doris/be/src/common/signal_handler.h:417
1# os::Linux::chained_handler(int, siginfo_t*, void*) in /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so
2# JVM_handle_linux_signal in /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so
3# signalHandler(int, siginfo_t*, void*) in /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so
4# 0x00007F4ABB927520 in /lib/x86_64-linux-gnu/libc.so.6
5# std::default_delete<doris::vectorized::Block>::operator()(doris::vectorized::Block*) const at /var/local/ldb-toolchain/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/unique_ptr.h:85
6# doris::pipeline::MultiCastDataStreamer::close_sender(int) at /root/doris_branch-2.0/doris/be/src/pipeline/exec/multi_cast_data_streamer.cpp:60
7# doris::pipeline::MultiCastDataStreamerSourceOperator::close(doris::RuntimeState*) at /root/doris_branch-2.0/doris/be/src/pipeline/exec/multi_cast_data_stream_source.cpp:120
8# doris::pipeline::PipelineTask::close() at /root/doris_branch-2.0/doris/be/src/pipeline/pipeline_task.cpp:334
9# doris::pipeline::TaskScheduler::_try_close_task(doris::pipeline::PipelineTask*, doris::pipeline::PipelineTaskState) at /root/doris_branch-2.0/doris/be/src/pipeline/task_scheduler.cpp:353
10# doris::pipeline::TaskScheduler::_do_work(unsigned long) in /mnt/disk1/STRESS_ENV/be/lib/doris_be
11# doris::ThreadPool::dispatch_thread() in /mnt/disk1/STRESS_ENV/be/lib/doris_be
12# doris::Thread::supervise_thread(void*) at /root/doris_branch-2.0/doris/be/src/util/thread.cpp:499
13# start_thread at ./nptl/pthread_create.c:442
14# 0x00007F4ABBA0B850 at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:83
```
<!--Describe your changes.-->
