gh-142414: Remove singleton design pattern in _crossinterp.py #142553
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Test with
./python -m test test_interpreters test_struct./python -m test test_interpreters test_structfails with: KeyError: concurrent.interpreters._queues.UNBOUND #142414 (comment) by Victor../python -m test test_interpreters(after adding the Victor's test into this PR)Singleton is removed per suggestion in #142414 (comment)
I also had another PR to keep the singleton: #142515
./python -m test test_interpreters test_structfails with: KeyError: concurrent.interpreters._queues.UNBOUND #142414