[issue41718] test.regrtest has way too many imports

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> You could save/restore this data only when corresponded modules was imported, like it was done in clear_caches() in refleak.py.

It was my first idea, but some large modules like multiprocessing and asyncio are only imported by tested when the test file is imported, whereas save_environment() is called (__enter__) before the import in libregrtest.runtest.

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<https://bugs.python.org/issue41718>
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