feat: Add `ValidationLevel` tooling and apply to `constant_fold_pass` #502

Job	Run time
Check for changes in Rust files	3s
benches	33s
check	12s
tests (Rust stable)	47s
tests (Rust 1.75)	28s
tests (Rust beta)	36s
tests (Rust nightly)	33s
Required checks 🦀	1s
coverage	0s
	3m 13s

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