[issue45229] Always use unittest for collecting tests in regrtests

[Łukasz Langa]

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


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pull_requests: +27218
pull_request: https://github.com/python/cpython/pull/28929

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45229>
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