PYTHON-5668 - Merge backpressure branch into mainline #9179

Job	Run time
Coverage	1s
Typing Tests (3.11)	1s
static	1s
CPython 3.10-ubuntu-latest	1s
Typing Tests (3.10)	1s
Integration Tests	1s
Link Check	1s
CPython pypy-3.11-ubuntu-latest	1s
Docs Checks	1s
CPython 3.13t-ubuntu-latest	1s
DocTest	1s
Make an sdist	1s
Test minimum dependencies and Python	1s
Install from SDist and Test	1s
	14s

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