PYTHON-5289 Validate ignored bits are 0 on write for bson.BinaryVector #7715

Job	Run time
static	3m 2s
DocTest	58s
CPython 3.9-ubuntu-latest	9m 3s
Docs Checks	47s
CPython pypy-3.10-ubuntu-latest	10m 17s
CPython 3.13-ubuntu-latest	8m 54s
CPython 3.13t-ubuntu-latest	9m 12s
Link Check	6m 49s
Test async's minimum dependencies and Python	46s
Typing Tests (3.9)	1m 14s
Test using minimum dependencies and supported Python	30s
Make an sdist	15s
Typing Tests (3.11)	1m 5s
Install from SDist and Test	43s
	53m 35s

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