PYTHON-4780 Implement fast path for server selection with Primary (#2… #7829

Job	Run time
Typing Tests (3.9)	1m 26s
Make an sdist	10s
static	4m 7s
Typing Tests (3.11)	1m 19s
CPython 3.9-ubuntu-latest	9m 2s
DocTest	1m 22s
Test using minimum dependencies and supported Python	1m 21s
CPython 3.13t-ubuntu-latest	9m 15s
CPython pypy-3.10-ubuntu-latest	10m 25s
Test async's minimum dependencies and Python	1m 15s
Link Check	2m 44s
CPython 3.13-ubuntu-latest	9m 3s
Docs Checks	1m 20s
Install from SDist and Test	1m 5s
	53m 54s

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