GRPC core when running tiflash random failpoint tests

Run tiflash random failpoints test, enable "random_join_build_failpoint", tifalsh crashed with little possiblity:

       0xaa1df4d    faultSignalHandler(int, siginfo_t*, void*) [tiflash+178380621]
                    libs/libdaemon/src/BaseDaemon.cpp:221
  0x7f1cadebf630    <unknown symbol> [libpthread.so.0+63024]
  0x7f1cad902387    gsignal [libc.so.6+222087]
  0x7f1cad903a78    __GI_abort [libc.so.6+227960]
  0x7f1cad8fb1a6    __assert_fail_base [libc.so.6+192934]
  0x7f1cad8fb252    __assert_fail [libc.so.6+193106]
       0xc4509a1    grpc_core::RefCount::RefNonZero(grpc_core::DebugLocation const&, char const*) [tiflash+205851041]
                    contrib/grpc/src/core/lib/gprpp/ref_counted.h:137
       0xc4508a5    grpc_stream_ref(grpc_stream_refcount*, char const*) [tiflash+205850789]
                    contrib/grpc/src/core/lib/transport/transport.h:88
       0xc62c401    grpc_chttp2_stream_ref(grpc_chttp2_stream*, char const*) [tiflash+207799297]
                    contrib/grpc/src/core/ext/transport/chttp2/transport/chttp2_transport.cc:606
       0xc62df71    grpc_chttp2_mark_stream_writable(grpc_chttp2_transport*, grpc_chttp2_stream*) [tiflash+207806321]
                    contrib/grpc/src/core/ext/transport/chttp2/transport/chttp2_transport.cc:928
       0xc63210f    read_action_locked(void*, grpc_error*) [tiflash+207823119]
                    contrib/grpc/src/core/ext/transport/chttp2/transport/chttp2_transport.cc:2548
       0xc49c693    grpc_combiner_continue_exec_ctx() [tiflash+206161555]
                    contrib/grpc/src/core/lib/iomgr/combiner.cc:236
       0xc49fad2    grpc_core::ExecCtx::Flush() [tiflash+206174930]
                    contrib/grpc/src/core/lib/iomgr/exec_ctx.cc:156
       0xc4a0778    grpc_core::Executor::RunClosures(char const*, grpc_closure_list) [tiflash+206178168]
                    contrib/grpc/src/core/lib/iomgr/executor.cc:130
       0xc4a0a96    grpc_core::Executor::ThreadMain(void*) [tiflash+206178966]
                    contrib/grpc/src/core/lib/iomgr/executor.cc:248
       0xc7c9906    grpc_core::(anonymous namespace)::ThreadInternalsPosix::ThreadInternalsPosix(char const*, void (*)(void*), void*, bool*, grpc_core::Thread::Options const&)::'lambda'(void*)::operator()(void*) const [tiflash+209492230]
                    contrib/grpc/src/core/lib/gprpp/thd_posix.cc:140
       0xc7c9815    grpc_core::(anonymous namespace)::ThreadInternalsPosix::ThreadInternalsPosix(char const*, void (*)(void*), void*, bool*, grpc_core::Thread::Options const&)::'lambda'(void*)::__invoke(void*) [tiflash+209491989]
                    contrib/grpc/src/core/lib/gprpp/thd_posix.cc:110
  0x7f1cadeb7ea5    start_thread [libpthread.so.0+32421]"] [thread_id=1037]


another core stack:
[2022/08/31 14:58:20.695 +08:00] [ERROR] [BaseDaemon.cpp:570] ["BaseDaemon:
       0xaa891ddfaultSignalHandler(int, siginfo_t*, void*) [tiflash+178819549]
                libs/libdaemon/src/BaseDaemon.cpp:221
  0x7fd07bf9a630<unknown symbol> [libpthread.so.0+63024]
  0x7fd07b9dd387gsignal [libc.so.6+222087]
  0x7fd07b9dea78__GI_abort [libc.so.6+227960]
  0x7fd07b9d61a6__assert_fail_base [libc.so.6+192934]
  0x7fd07b9d6252__assert_fail [libc.so.6+193106]
       0xc4b92e1grpc_core::RefCount::RefNonZero(grpc_core::DebugLocation const&, char const*) [tiflash+206279393]
                contrib/grpc/src/core/lib/gprpp/ref_counted.h:137
       0xc4b91e5grpc_stream_ref(grpc_stream_refcount*, char const*) [tiflash+206279141]
                contrib/grpc/src/core/lib/transport/transport.h:88
       0xc694d41grpc_chttp2_stream_ref(grpc_chttp2_stream*, char const*) [tiflash+208227649]
                contrib/grpc/src/core/ext/transport/chttp2/transport/chttp2_transport.cc:606
       0xc6968b1grpc_chttp2_mark_stream_writable(grpc_chttp2_transport*, grpc_chttp2_stream*) [tiflash+208234673]
                contrib/grpc/src/core/ext/transport/chttp2/transport/chttp2_transport.cc:928
       0xc69aa4fread_action_locked(void*, grpc_error*) [tiflash+208251471]
                contrib/grpc/src/core/ext/transport/chttp2/transport/chttp2_transport.cc:2548
       0xc504fd3grpc_combiner_continue_exec_ctx() [tiflash+206589907]
                contrib/grpc/src/core/lib/iomgr/combiner.cc:236
       0xc508412grpc_core::ExecCtx::Flush() [tiflash+206603282]
                contrib/grpc/src/core/lib/iomgr/exec_ctx.cc:156
       0xc50ca9cpollset_work(grpc_pollset*, grpc_pollset_worker**, long) [tiflash+206621340]
                contrib/grpc/src/core/lib/iomgr/ev_epollex_linux.cc:1136
       0xc50b393pollset_work(grpc_pollset*, grpc_pollset_worker**, long) [tiflash+206615443]
                contrib/grpc/src/core/lib/iomgr/ev_posix.cc:324
       0xc517b8egrpc_pollset_work(grpc_pollset*, grpc_pollset_worker**, long) [tiflash+206666638]
                contrib/grpc/src/core/lib/iomgr/pollset.cc:48
       0xc538ffbcq_next(grpc_completion_queue*, gpr_timespec, void*) [tiflash+206802939]
                contrib/grpc/src/core/lib/surface/completion_queue.cc:1038
       0xc53854agrpc_completion_queue_next [tiflash+206800202]
                contrib/grpc/src/core/lib/surface/completion_queue.cc:1114
       0xc4783acgrpc_impl::CompletionQueue::AsyncNextInternal(void**, bool*, gpr_timespec) [tiflash+206013356]
                contrib/grpc/src/cpp/common/completion_queue_cc.cc:48
       0x4737035grpc_impl::CompletionQueue::Next(void**, bool*) [tiflash+74674229]
                contrib/grpc/include/grpcpp/impl/codegen/completion_queue_impl.h:176
       0x47367e8DB::(anonymous namespace)::handleRpcs(grpc_impl::ServerCompletionQueue*, std::__1::shared_ptr<DB::Logger> const&) [tiflash+74672104]
                dbms/src/Server/FlashGrpcServerHolder.cpp:42
       0x473917fDB::FlashGrpcServerHolder::FlashGrpcServerHolder(DB::Context&, Poco::Util::LayeredConfiguration&, DB::TiFlashSecurityConfig&, DB::TiFlashRaftConfig const&, std::__1::shared_ptr<DB::Logger> const&)::$_6::operator()() const [tiflash+74682751]
                dbms/src/Server/FlashGrpcServerHolder.cpp:156```

Start by reproducing the TiFlash random failpoint test with "random_join_build_failpoint" enabled and compare the two reported gRPC core stacks. Read contrib/grpc/src/core/lib/gprpp/ref_counted.h, the referenced chttp2 transport files, and dbms/src/Server/FlashGrpcServerHolder.cpp around lines 42 and 156. Done means the intermittent crash is explained and the relevant test no longer fails.