Migrate pallet-balances to umbrella style #16781

Job	Run time
check-dependency-rules	8s
check-fail-ci	14s
check-markdown	18s
check-readme	3m 19s
check-workspace	13s
preflight / preflight	48s
preflight / ci-versions	59s
check-rust-feature-propagation	1m 56s
check-toml-format	1m 2s
check-umbrella	2m 15s
fmt	1m 9s
test-rust-features	2m 4s
All quick checks passed	1s
	14m 26s

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