Migrate `pallet-whitelist` to umbrella crate #14535

Job	Run time
check-dependency-rules	9s
check-markdown	16s
check-workspace	17s
check-fail-ci	12s
check-readme	3m 7s
preflight / preflight	1m 23s
preflight / ci-versions	1m 34s
fmt	1m 27s
test-rust-features	2m 23s
check-rust-feature-propagation	2m 49s
check-toml-format	1m 6s
check-umbrella	2m 46s
All quick checks passed	1s
	17m 30s

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