[Bug dap/31354] [gdb/dap] FAIL: gdb.dap/pause.exp: python command failed

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31354

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
So, AFAICT the following happens:
- dap calls gdb.interrupt to cancel a request
- in gdbpy_interrupt, the quit flag is set
- at the end of gdbpy_interrupt, the no_python_sigint destructor is called,
  which calls restore_active_language, during which check_quit_flag is called,
  followed by set_quit_flag
- this calls gdbpy_set_quit_flag, which calls PyErr_SetInterrupt
  (I'm not sure if that's legal at this point.  It's not necessary to hold the
GIL,
  but we're also in a PyEval_SaveThread context which has set thread state to
null).
- the interrupt is caught while executing the python script using
PyRun_SimpleFile,
  throwing a KeyboardInterrupt exception
- the KeyboardInterrupt propagates up to PyRun_SimpleFile, where the exception
is
  dumped on the output 
- PyRun_SimpleFile returns -1 because of the KeyboardInterrupt exception, but
  that's silently ignored by python_run_simple_file

The KeyboardInterrupt is intended to propagate all the way up to the python
runnable, which would capture the exception and hand it back to the dap thread,
but instead it's captured by PyRun_SimpleFile.

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