feat: Add `SiblingSubgraph::from_node` (#1655) #2530

Job	Run time
Check for changes in Python files	4s
check python 3.10	11s
Check serialization schema	7s
Build HUGR binary	59s
check python 3.13	22s
test python 3.10	19s
test python 3.13	28s
Required checks 🐍	1s
	2m 31s

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