[issue45177] Use shared test loader when possible when running test suite

[Serhiy Storchaka]

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

See issue45181. Most of this code is gone.

Also, TestLoader has mutable attribute "errors". I am not sure that it is good idea to share it between unrelated tests.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45177>
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