[issue30695] add a nomemory_allocator to the _testcapi module

[STINNER Victor]

STINNER Victor added the comment:

I prefer your new PR. But is it useful to test N memory allocation failures in a row? The API and the code would be simpler if we would only test a single failure. What do you think?

I know that pyfailmalloc is different, but I'm not sure that pyfailmalloc design is right neither :-)

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