PYTHON-5672 Refactor connection checkout to reduce layers#2893

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Commits on Jun 25, 2026

PYTHON-5672 Refactor connection checkout to reduce layers
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PYTHON-5672 Add __slots__ and lazy _deprioritized_servers to _ClientConnectionRetryable
blink1073
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PYTHON-5672 Fix SDAM error handling when pool checkout raises in __aenter__
blink1073
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PYTHON-5672 Fix MockPool.checkout() bypass in _ClientCheckout
blink1073
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PYTHON-5672 Add coverage for _PoolCheckout leak guard; remove dead server.checkout()
blink1073
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PYTHON-5672 Test _ClientCheckout post-checkout setup failure returns connection
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PYTHON-5672 Fix test_client_checkout_setup_failure on freethreaded Python
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