Backport/2412: Expose the unstable metadata v16 #14884

Job	Run time
check-dependency-rules	8s
check-fail-ci	12s
check-markdown	15s
check-workspace	18s
preflight / preflight	1m 21s
preflight / ci-versions	1m 17s
check-toml-format	1m 10s
fmt	1m 14s
check-rust-feature-propagation	2m 19s
test-rust-features	2m 20s
check-umbrella	2m 44s
All quick checks passed	1s
	13m 19s

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