feat: Lower array repeat and scan ops (#1717) #2848

Job	Run time
Check for changes	4s
tests (Rust nightly, coverage)	4m 42s
Build benchmarks 🏋️	2m 15s
tests (Rust 1.75)	3m 42s
check	1m 44s
tests (Rust beta)	3m 17s
tests (Rust stable, all features)	3m 13s
tests hugr-llvm (14.0, 14-0)	2m 23s
tests (Rust stable, no features)	2m 30s
Check standard extensions	4s
Required checks 🦀	1s
	23m 55s

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