PYTHON-5259 - Better test assertions for error substrings #2039

Job	Run time
Build wheels for manylinux_x86_64	2m 51s
Build wheels for manylinux_aarch64	11m 41s
Make SDist	1m 1s
Build wheels for manylinux_ppc64le	11m 29s
Build wheels for manylinux_s390x	11m 20s
Build wheels for manylinux_i686	2m 33s
Build wheels for win_amd6	3m 53s
Build wheels for win32	5m 30s
Build wheels for macos	3m 25s
Download Wheels	6s
	53m 49s

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