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ARROW-15454: [Python] Try to make CSV cancellation test more robust

Use `signal.set_wakeup_fd` to wait reliably for the signal to get to the Python interpreter.

Closes #12260 from pitrou/ARROW-15454-csv-cancellation

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>