[issue40275] test.support has way too many imports

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

Hi, terry. When creating the new test helpers, the docs have been updated.
such as: https://docs.python.org/3.10/library/test.html#module-test.support.os_helper

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<https://bugs.python.org/issue40275>
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