Migrate pallet-metadata-hash-extension to use umbrella crate #19262

Job	Run time
check-dependency-rules	8s
check-workspace	29s
check-fail-ci	40s
check-markdown	40s
check-readme	3m 49s
preflight / preflight	1m 23s
preflight / ci-versions	1m 12s
check-toml-format	1m 23s
check-rust-feature-propagation	2m 25s
check-umbrella	2m 20s
fmt	1m 37s
test-rust-features	2m 24s
All quick checks passed	1s
	18m 31s

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