[chore](branch-1.2) remove unnecessary deserialize in tablet sink

[xy720]

Proposed changes

Issue Number: close #xxx

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[lide-reed]

https://github.com/apache/doris/pull/23531/files

[lide-reed]

LGTM

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[cambyzju]

LGTM

[lide-reed]

F0309 21:30:43.347543 892102 vtablet_sink.cpp:305] Check failed: block.rows() == tmp_block.rows()
*** Check failure stack trace: ***
@ 0x5561452dd54d google::LogMessage::Fail()
@ 0x5561452dfa89 google::LogMessage::SendToLog()
@ 0x5561452dd0b6 google::LogMessage::Flush()
@ 0x5561452e00f9 google::LogMessageFatal::~LogMessageFatal()
@ 0x556144c71eeb doris::stream_load::VNodeChannel::try_send_block()
@ 0x55614010d625 doris::ThreadPool::dispatch_thread()
@ 0x556140102a7f doris::Thread::supervise_thread()
@ 0x7fc0e6d0fea5 start_thread
@ 0x7fc0e70229fd __clone
@ (nil) (unknown)
*** Query id: f8cb1c18a2e44351-850456f175c6328b ***
*** Aborted at 1709991047 (unix time) try "date -d @1709991047" if you are using GNU date ***
*** Current BE git commitID: e21e1ca ***
*** SIGABRT unkown detail explain (@0x3e8000d9b63) received by PID 891747 (TID 0x7fc064240700) from PID 891747; stack trace: ***
0# doris::signal::(anonymous namespace)::FailureSignalHandler(int, siginfo_t*, void*) at /data/doris-1.x/be/src/common/signal_handler.h:420
1# 0x00007FC0E6F5A400 in /lib64/libc.so.6
2# __GI_raise in /lib64/libc.so.6
3# abort in /lib64/libc.so.6
4# 0x00005561452E7F39 in /usr/local/service/doris/lib/be/doris_be
5# 0x00005561452DD54D in /usr/local/service/doris/lib/be/doris_be
6# google::LogMessage::SendToLog() in /usr/local/service/doris/lib/be/doris_be
7# google::LogMessage::Flush() in /usr/local/service/doris/lib/be/doris_be
8# google::LogMessageFatal::~LogMessageFatal() in /usr/local/service/doris/lib/be/doris_be
9# doris::stream_load::VNodeChannel::try_send_block(doris::RuntimeState*) at /data/doris-1.x/be/src/vec/sink/vtablet_sink.cpp:354
10# doris::ThreadPool::dispatch_thread() at /data/doris-1.x/be/src/util/threadpool.cpp:543
11# doris::Thread::supervise_thread(void*) at /data/doris-1.x/be/src/util/thread.cpp:455
12# start_thread in /lib64/libpthread.so.0
13# __clone in /lib64/libc.so.6