[pallet-balances] Add SimpleStorageUpdate to migrate balances without any additional inactive tracks #7471

Job	Run time
preflight / preflight	40s
preflight / ci-versions	6m 14s
build (polkadot-availability-recovery, availability-recovery-regression-bench)	2m 59s
build (polkadot-availability-distribution, availability-distribution-regression-bench)	3m 0s
build (polkadot-node-core-approval-voting, approval-voting-regression-bench)	2m 50s
build (polkadot-statement-distribution, statement-distribution-regression-bench)	2m 56s
publish-benchmarks	0s
	18m 39s

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