PYTHON-5488 - MongoClient.append_metadata should not add duplicates #2657

Job	Run time
Make SDist	31s
Build wheels for manylinux_s390x	11m 54s
Build wheels for manylinux_x86_64	2m 21s
Build wheels for manylinux_aarch64	11m 36s
Build wheels for win_amd6	4m 15s
Build wheels for win32	4m 28s
Build wheels for manylinux_i686	2m 28s
Build wheels for manylinux_ppc64le	10m 51s
Build wheels for macos	3m 46s
Download Wheels	10s
	52m 20s

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