feat: `HugrMut::remove_metadata` #2428

Job	Run time
Check for changes	3s
check	1m 9s
tests (Rust nightly, coverage)	1m 51s
tests (Rust 1.75)	2m 0s
tests (Rust stable, all features)	2m 57s
tests (Rust beta)	2m 11s
tests (Rust stable, no features)	1m 27s
Build benchmarks 🏋️	5m 31s
rs-semver-checks / Rust semver-checks 🦀	3m 24s
Check standard extensions	8s
Required checks 🦀	1s
	20m 42s

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