[issue45229] Always use unittest for collecting tests in regrtests

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

See issue40058 and issue40173.

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dependencies: +Running test_datetime twice fails with: module 'datetime' has no attribute '_divide_and_round', test.support.import_fresh_module fails to correctly block submodules when fresh is specified

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