PYTHON-5289 Validate ignored bits are 0 on write for bson.BinaryVector #7750

Job	Run time
DocTest	53s
static	3m 4s
Docs Checks	29s
CPython 3.13-ubuntu-latest	8m 57s
CPython pypy-3.10-ubuntu-latest	10m 25s
Make an sdist	13s
Typing Tests (3.11)	1m 4s
CPython 3.9-ubuntu-latest	9m 2s
CPython 3.13t-ubuntu-latest	9m 2s
Test using minimum dependencies and supported Python	36s
Link Check	10m 34s
Typing Tests (3.9)	1m 18s
Test async's minimum dependencies and Python	40s
Install from SDist and Test	37s
	56m 54s

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