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Detach `Mesh` from `_UnstructuredFile` #2108

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Run time

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Job	Run time
build (ubuntu-latest, 3.8)	2m 6s
build (ubuntu-latest, 3.12)	2m 10s
build (windows-latest, 3.8)	3m 50s
build (windows-latest, 3.12)	4m 9s
	12m 15s