[3.13] gh-135124: Change stdout errors in regrtest worker process (GH-135138) #135169
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Set sys.stdout encoder error handler to backslashreplace in regrtest
workers to avoid UnicodeEncodeError when printing a traceback
or any other non-encodable character.
Move the code from the Regrtest class to setup_process().
Call setup_process() earlier, before displaying regrtest headers.
(cherry picked from commit 3d396ab)
Co-authored-by: Victor Stinner vstinner@python.org