PYTHON-5772 Increase _gcp_helpers.py coverage #3691

Job	Run time
Make SDist	44s
Build wheels for manylinux_x86_64	2m 10s
Build wheels for manylinux_i686	2m 30s
Build wheels for manylinux_ppc64le	13m 23s
Build wheels for win_amd6	4m 27s
Build wheels for manylinux_aarch64	15m 3s
Build wheels for macos	4m 26s
Build wheels for win_arm64	11m 1s
Build wheels for win32	4m 40s
Build wheels for manylinux_s390x	15m 18s
Download Wheels	9s
	1h 13m 51s

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