PYTHON-5758 Remove unused validation functions #3648

Job	Run time
Make SDist	46s
Build wheels for win_arm64	8m 58s
Build wheels for win32	5m 26s
Build wheels for manylinux_s390x	14m 53s
Build wheels for manylinux_ppc64le	13m 51s
Build wheels for manylinux_x86_64	2m 8s
Build wheels for manylinux_aarch64	14m 46s
Build wheels for win_amd6	4m 42s
Build wheels for macos	5m 2s
Build wheels for manylinux_i686	2m 27s
Download Wheels	11s
	1h 13m 10s

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