PYTHON-5544 Revert changes to base protocol layer #8175

Job	Run time
DocTest	1m 10s
Make an sdist	14s
Docs Checks	41s
static	3m 18s
CPython 3.9-ubuntu-latest	11m 41s
Link Check	1m 45s
CPython 3.13t-ubuntu-latest	11m 27s
Typing Tests (3.11)	1m 5s
CPython pypy-3.10-ubuntu-latest	12m 23s
Test using minimum dependencies and supported Python	42s
Typing Tests (3.9)	1m 5s
Test async's minimum dependencies and Python	39s
Install from SDist and Test	1m 4s
DocTest	1m 10s
CPython 3.9-ubuntu-latest	11m 41s
Docs Checks	41s
static	3m 18s
Link Check	1m 45s
Typing Tests (3.9)	1m 5s
CPython pypy-3.10-ubuntu-latest	12m 30s
Test using minimum dependencies and supported Python	42s
Test async's minimum dependencies and Python	39s
CPython 3.13t-ubuntu-latest	11m 27s
Typing Tests (3.11)	1m 5s
Make an sdist	14s
Install from SDist and Test	1m 4s
	1h 34m 35s

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