[issue42934] use TracebackException's new compact param in unittest.TestResult

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


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nosy: +ezio.melotti, michael.foord, rbcollins

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42934>
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