feat: Add `SiblingSubgraph::from_node` #2528

Job	Run time
Check for changes in Python files	4s
Build HUGR binary	55s
Check serialization schema	15s
check python 3.10	17s
check python 3.13	29s
test python 3.10	22s
test python 3.13	37s
Required checks 🐍	1s
	3m 0s

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