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Detach `Mesh` from `_UnstructuredFile` #2106

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Run time

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Job	Run time
build (ubuntu-latest, 3.8)	2m 7s
build (ubuntu-latest, 3.12)	2m 44s
build (windows-latest, 3.8)	4m 3s
build (windows-latest, 3.12)	5m 18s
	14m 12s