PYTHON-5406 - AsyncPeriodicExecutor must reset CSOT contextvars befor… #2375

Job	Run time
Build wheels for manylinux_x86_64	2m 15s
Build wheels for manylinux_aarch64	11m 28s
Make SDist	42s
Build wheels for manylinux_ppc64le	11m 2s
Build wheels for manylinux_s390x	11m 46s
Build wheels for manylinux_i686	2m 20s
Build wheels for win_amd6	4m 45s
Build wheels for win32	4m 45s
Build wheels for macos	4m 32s
Download Wheels	9s
	53m 44s

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