feat: Add `ValidationLevel` tooling and apply to `constant_fold_pass` #504

Job	Run time
Check for changes in Rust files	5s
check	1m 7s
tests (Rust stable)	1m 59s
benches	2m 19s
tests (Rust 1.75)	2m 9s
tests (Rust beta)	2m 0s
tests (Rust nightly)	2m 8s
Required checks 🦀	1s
coverage	0s
	11m 48s

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