refactor: avoid hugr clone in simple replace (#1724) #2738

Job	Run time
Check for changes	4s
tests (Rust stable, all features)	2m 45s
tests (Rust stable, no features)	1m 50s
check	1m 29s
Build benchmarks 🏋️	2m 14s
tests (Rust nightly, coverage)	3m 19s
tests (Rust 1.75)	2m 51s
tests hugr-llvm (14.0, 14-0)	1m 32s
tests (Rust beta)	2m 26s
Check standard extensions	3s
Required checks 🦀	1s
	18m 34s

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