feat: Add `SiblingSubgraph::from_node` #2527

Job	Run time
Check for changes in Python files	9s
Check serialization schema	10s
check python 3.10	10s
Build HUGR binary	42s
check python 3.13	30s
test python 3.10	25s
test python 3.13	32s
Required checks 🐍	1s
	2m 39s

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