sagemathgh-36311: src/sage/doctest/control.py: log cysignals crashes to DOT_SAGE
    
The long version is in the commit message, but the short version is:
don't override `CYSIGNALS_CRASH_LOGS` with a `tmp_dir()` because we try
very hard to delete every `tmp_dir()` as soon as sage exits.
    
URL: sagemath#36311
Reported by: Michael Orlitzky
Reviewer(s): Dima Pasechnik

Author: Release Manager

src/sage/doctest/control.py

@@ -55,7 +55,6 @@
 from sage.doctest.util import Timer, count_noun, dict_difference
 from sage.env import DOT_SAGE, SAGE_EXTCODE, SAGE_LIB, SAGE_SRC
 from sage.misc import randstate
-from sage.misc.temporary_file import tmp_dir
 from sage.structure.sage_object import SageObject
 
 # Optional tags which are always automatically added
@@ -1368,8 +1367,6 @@ def run_val_gdb(self, testing=False):
             return
 
         # Setup signal handlers.
-        # Save crash logs in temporary directory.
-        os.putenv('CYSIGNALS_CRASH_LOGS', tmp_dir("crash_logs_"))
         init_cysignals()
 
         import signal