Migrate pallet-balances to umbrella style #8753

Job	Run time
preflight / preflight	43s
preflight / ci-versions	1m 0s
cargo-check-all-crate-macos	11m 33s
cargo-check-benches (master)	24m 15s
cargo-check-benches (current)	24m 39s
cargo-check-each-crate (1)	24m 21s
test-frame-ui	26m 54s
test-full-crypto-feature	2m 26s
cargo-check-each-crate (2)	21m 42s
cargo-check-each-crate (3)	7m 40s
test-node-metrics	11m 55s
cargo-check-each-crate (4)	28m 7s
cargo-check-each-crate (5)	29m 34s
cargo-check-each-crate (6)	14m 33s
cargo-check-each-crate (7)	29m 38s
test-frame-examples-compile-to-wasm	3m 20s
test-deterministic-wasm	7m 46s
check-tracing	2m 11s
check-metadata-hash	6m 45s
node-bench-regression-guard	16s
All test misc tests passed	1s
	4h 39m 19s

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