[issue44852] Add ability to wholesale silence DeprecationWarnings while running the test suite

[Łukasz Langa]

Change by Łukasz Langa <lukasz at langa.pl>:


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pull_requests: +26253
pull_request: https://github.com/python/cpython/pull/27784

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44852>
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