PYTHON-4862 Fix handling of interrupt_loop in unified test runner #961

Job	Run time
Build wheels for manylinux_x86_64	2m 10s
Make SDist	30s
Build wheels for manylinux_aarch64	10m 28s
Build wheels for manylinux_ppc64le	10m 3s
Build wheels for manylinux_s390x	10m 40s
Build wheels for manylinux_i686	2m 15s
Build wheels for win_amd6	4m 6s
Build wheels for win32	6m 8s
Build wheels for macos	2m 40s
Download Wheels	7s
	49m 7s

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