[gdb/dap] Fix exit race

When running test-case gdb.dap/eof.exp, we're likely to get a coredump due to
a segfault in new_threadstate.

At the point of the core dump, the gdb main thread looks like:
...
 (gdb) bt
 #0  0x0000fffee30d2280 in __pthread_kill_implementation () from /lib64/libc.so.6
 #1  0x0000fffee3085800 [PAC] in raise () from /lib64/libc.so.6
 #2  0x00000000007b03e8 [PAC] in handle_fatal_signal (sig=11)
     at gdb/event-top.c:926
 #3  0x00000000007b0470 in handle_sigsegv (sig=11)
     at gdb/event-top.c:976
 #4  <signal handler called>
 #5  0x0000fffee3a4db14 in new_threadstate () from /lib64/libpython3.12.so.1.0
 #6  0x0000fffee3ab0548 [PAC] in PyGILState_Ensure () from /lib64/libpython3.12.so.1.0
 #7  0x0000000000a6d034 [PAC] in gdbpy_gil::gdbpy_gil (this=0xffffcb279738)
     at gdb/python/python-internal.h:787
 #8  0x0000000000ab87ac in gdbpy_event::~gdbpy_event (this=0xfffea8001ee0,
     __in_chrg=<optimized out>) at gdb/python/python.c:1051
 #9  0x0000000000ab9460 in std::_Function_base::_Base_manager<...>::_M_destroy
     (__victim=...) at /usr/include/c++/13/bits/std_function.h:175
 #10 0x0000000000ab92dc in std::_Function_base::_Base_manager<...>::_M_manager
     (__dest=..., __source=..., __op=std::__destroy_functor)
     at /usr/include/c++/13/bits/std_function.h:203
 #11 0x0000000000ab8f14 in std::_Function_handler<...>::_M_manager(...) (...)
     at /usr/include/c++/13/bits/std_function.h:282
 #12 0x000000000042dd9c in std::_Function_base::~_Function_base (this=0xfffea8001c10,
     __in_chrg=<optimized out>) at /usr/include/c++/13/bits/std_function.h:244
 #13 0x000000000042e654 in std::function<void ()>::~function() (this=0xfffea8001c10,
     __in_chrg=<optimized out>) at /usr/include/c++/13/bits/std_function.h:334
 #14 0x0000000000b68e60 in std::_Destroy<std::function<void ()> >(...) (...)
     at /usr/include/c++/13/bits/stl_construct.h:151
 #15 0x0000000000b68cd0 in std::_Destroy_aux<false>::__destroy<...>(...) (...)
     at /usr/include/c++/13/bits/stl_construct.h:163
 #16 0x0000000000b689d8 in std::_Destroy<...>(...) (...)
     at /usr/include/c++/13/bits/stl_construct.h:196
 #17 0x0000000000b68414 in std::_Destroy<...>(...) (...)
     at /usr/include/c++/13/bits/alloc_traits.h:948
 #18 std::vector<...>::~vector() (this=0x2a183c8 <runnables>)
     at /usr/include/c++/13/bits/stl_vector.h:732
 #19 0x0000fffee3088370 in __run_exit_handlers () from /lib64/libc.so.6
 #20 0x0000fffee3088450 [PAC] in exit () from /lib64/libc.so.6
 #21 0x0000000000c95600 [PAC] in quit_force (exit_arg=0x0, from_tty=0)
     at gdb/top.c:1822
 #22 0x0000000000609140 in quit_command (args=0x0, from_tty=0)
     at gdb/cli/cli-cmds.c:508
 #23 0x0000000000c926a4 in quit_cover () at gdb/top.c:300
 #24 0x00000000007b09d4 in async_disconnect (arg=0x0)
     at gdb/event-top.c:1230
 #25 0x0000000000548acc in invoke_async_signal_handlers ()
     at gdb/async-event.c:234
 #26 0x000000000157d2d4 in gdb_do_one_event (mstimeout=-1)
     at gdbsupport/event-loop.cc:199
 #27 0x0000000000943a84 in start_event_loop () at gdb/main.c:401
 #28 0x0000000000943bfc in captured_command_loop () at gdb/main.c:465
 #29 0x000000000094567c in captured_main (data=0xffffcb279d08)
     at gdb/main.c:1335
 #30 0x0000000000945700 in gdb_main (args=0xffffcb279d08)
     at gdb/main.c:1354
 #31 0x0000000000423ab4 in main (argc=14, argv=0xffffcb279e98)
     at gdb/gdb.c:39
...

The direct cause of the segfault is calling PyGILState_Ensure after
calling Py_Finalize.

AFAICT the problem is a race between the gdb main thread and DAP's JSON writer
thread.

On one side, we have the following events:
- DAP's JSON reader thread reads an EOF, and lets DAP's main thread known
  by writing None into read_queue
- DAP's main thread lets DAP's JSON writer thread known by writing None into
  write_queue
- DAP's JSON writer thread sees the None in its queue, and calls
  send_gdb("quit")
- a corresponding gdbpy_event is deposited in the runnables vector, to be
  run by the gdb main thread

On the other side, we have the following events:
- the gdb main thread receives a SIGHUP
- the corresponding handler calls quit_force, which calls do_final_cleanups
- one of the final cleanups is finalize_python, which calls Py_Finalize
- quit_force calls exit, which triggers the exit handlers
- one of the exit handlers is the destructor of the runnables vector
- destruction of the vector triggers destruction of the remaining element
- the remaining element is a gdbpy_event, and the destructor (indirectly)
  calls PyGILState_Ensure

It's good to note that both events (EOF and SIGHUP) are caused by this line in
the test-case:
...
catch "close -i $gdb_spawn_id"
...
where "expect close" closes the stdin and stdout file descriptors, which
causes the SIGHUP to be send.

So, for the system I'm running this on, the send_gdb("quit") is actually not
needed.

I'm not sure if we support any systems where it's actually needed.

Fix this by removing the send_gdb("quit").

Tested on aarch64-linux.

PR dap/31306
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31306

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