[issue39385] Add an assertNoLogs context manager to unittest TestCase

[Mark Dickinson]

Change by Mark Dickinson <dickinsm at gmail.com>:


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nosy: +mark.dickinson
nosy_count: 8.0 -> 9.0
pull_requests: +21362
pull_request: https://github.com/python/cpython/pull/22317

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