[issue39385] Add an assertNoLogs context manager to unittest TestCase

[Kit Yan Choi]

Change by Kit Yan Choi <kit at kychoi.org>:


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keywords: +patch
pull_requests: +17459
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18067

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39385>
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