Fix epoll test cleanup on Python 3.15 - #758
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Summary
Keep the test-owned epoll wrapper on a duplicate of uvloop's backend descriptor. The loop retains ownership of its descriptor and closes it itself.
This preserves the existing assertion that remove_reader() removes the socket from the same epoll instance, while avoiding a second close after loop.close() on Python 3.15.
Validation
On Ubuntu 24.04 with locally built uvloop master:
Why draft
Current source builds and basic loop smoke tests on 3.15/3.15t, but this is only a test-cleanup prerequisite, not a claim of complete 3.15 support. The full 3.15t optional test dependencies are currently blocked upstream: pyOpenSSL~=25.3.0 resolves to cryptography 46.0.7, whose PyO3 build rejects Python 3.15 free-threaded. I will not add 3.15/3.15t CI or release-wheel targets until that complete suite can run green.