[issue40987] Add tests to test_interpreters to import C extension modules converted to PEP 489 multiphase initialization

[STINNER Victor]

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

According to Dong-hee, importing dbm in a subinterpreter leaks references:
https://github.com/python/cpython/pull/20920#issuecomment-644856401

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