[pallet-balances] Add SimpleStorageUpdate to migrate balances without any additional inactive tracks #12557

Job	Run time
preflight / preflight	42s
preflight / ci-versions	1m 21s
check-runtime-migration (westend)	3m 31s
check-runtime-migration (asset-hub-westend)	3m 17s
check-runtime-migration (bridge-hub-westend)	3m 0s
check-runtime-migration (collectives-westend)	3m 0s
check-runtime-migration (coretime-westend)	3m 2s
All runtime migrations passed	1s
	17m 54s

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