Open mfdataset enchancement #15993

Job	Run time
detect ci trigger	3s
Event File	3s
ubuntu-latest py3.10	8m 53s
ubuntu-latest py3.12	10m 49s
macos-latest py3.10	6m 0s
macos-latest py3.12	7m 38s
windows-latest py3.10	16m 25s
windows-latest py3.12	17m 50s
ubuntu-latest py3.10 bare-minimum	1m 39s
ubuntu-latest py3.10 min-all-deps	8m 9s
ubuntu-latest py3.12 all-but-numba	8m 23s
ubuntu-latest py3.11 all-but-dask	6m 29s
ubuntu-latest py3.12 flaky	1m 41s
	1h 34m 2s

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