PYTHON-4631: Pushed PREPARE_SHELL creation into an env.sh file #439

Job	Run time
Build wheels for manylinux_x86_64	2m 16s
Make SDist	33s
Build wheels for manylinux_aarch64	9m 59s
Build wheels for manylinux_ppc64le	9m 24s
Build wheels for manylinux_s390x	10m 9s
Build wheels for manylinux_i686	2m 27s
Build wheels for win_amd6	5m 2s
Build wheels for win32	6m 12s
Build wheels for macos	2m 54s
Download Wheels	6s
	49m 2s

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