fix: Export `RemoveDeadFuncsError` #3328

Job	Run time
Check for changes in Python files	4s
Build HUGR binary	47s
check python 3.10	15s
Check serialization schema	9s
check python 3.13	22s
test python 3.10	38s
test python 3.13	37s
Required checks 🐍	1s
	2m 53s

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