Add copy option in DataTree.from_dict #13128

Job	Run time
detect ci trigger	6s
Event File	2s
ubuntu-latest py3.9	8m 45s
ubuntu-latest py3.12	8m 57s
macos-latest py3.9	7m 57s
macos-latest py3.12	8m 21s
windows-latest py3.9	8m 53s
windows-latest py3.12	8m 48s
ubuntu-latest py3.9 bare-minimum	1m 56s
ubuntu-latest py3.9 min-all-deps	6m 44s
ubuntu-latest py3.11 all-but-dask	7m 18s
ubuntu-latest py3.12 flaky	2m 0s
	1h 9m 47s

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