[fix](brpc) coredump caused by brpc checking (#44047)

[mrhhsg]

pick #44047

/root/doris/be/src/runtime/fragment_mgr.cpp:1064:20: runtime error: member call on null pointer of type 'doris::PBackendService_Stub'

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /root/doris/be/src/runtime/fragment_mgr.cpp:1064:20 in
*** Query id: 0-0 ***
*** is nereids: 0 ***
*** tablet id: 0 ***
*** Aborted at 1731663847 (unix time) try "date -d @1731663847" if you are using GNU date ***
*** Current BE git commitID: b663df0e50 ***
*** SIGSEGV address not mapped to object (@0x0) received by PID 17169 (TID 17463 OR 0x7f746d21a700) from PID 0; stack trace: ***
0# doris::signal::(anonymous namespace)::FailureSignalHandler(int, siginfo_t*, void*) at /root/doris/be/src/common/signal_handler.h:421
1# PosixSignals::chained_handler(int, siginfo_t*, void*) [clone .part.0] in /usr/lib/jvm/java-17-openjdk-amd64/lib/server/libjvm.so
2# JVM_handle_linux_signal in /usr/lib/jvm/java-17-openjdk-amd64/lib/server/libjvm.so
3# 0x00007F7601263090 in /lib/x86_64-linux-gnu/libc.so.6
4# doris::FragmentMgr::_check_brpc_available(std::shared_ptr<doris::PBackendService_Stub> const&, doris::FragmentMgr::BrpcItem const&) in /mnt/ssd01/pipline/OpenSourceDoris/clusterEnv/P0/Cluster0/be/lib/doris_be
5# doris::FragmentMgr::cancel_worker() at /root/doris/be/src/runtime/fragment_mgr.cpp:1022
6# doris::Thread::supervise_thread(void*) at /root/doris/be/src/util/thread.cpp:499
7# start_thread at /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:478
8# __clone at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

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Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
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    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

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[doris-robot]

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[mrhhsg]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.44% (9511/26104)
Line Coverage: 27.93% (78304/280320)
Region Coverage: 26.59% (40142/150985)
Branch Coverage: 23.39% (20401/87214)
Coverage Report: http://coverage.selectdb-in.cc/coverage/a953e77de04c8669f47426fca68310dc36eff266_a953e77de04c8669f47426fca68310dc36eff266/report/index.html